Colorado School of Mines-Environmental Science and Engineering

It sounds like you don't have to be an engineer to get into this program.  The acceptance rate is very high, despite the fact that it is one of the top engineering schools in the country.  However, the price tag is very high--$33,000 for in-state alone--and remission of all of those fees is not guaranteed.  It sounds like an interesting program, so it may be worth checking out.

Application Deadline:  January 15 for Fall Semester; Oct. 1 for Spring Semester
Degrees Offered:  MS (thesis and non-thesis options), PhD (does not require a Master's, but one is preferred)
Min GPA:  Admitted students have an average GPA of 3.42
GRE score:  Admitted students have a combined score of ~1200 (Avg:  679 Quantitative; 515 Verbal) Undergraduates who attended the school and had a GPA greater than 3.25 can have the GRE waived.
GRE subject:  Not required
Areas of Emphasis:  Water Treatment, Reclamation, and Reuse; Contaminant Hydrology and Water Resources; Applied Environmental Microbiology and Biotechnology; Environmental Characterization and Risk Analysis; Site Remediation and Environmental Restoration;  PhD students are not required to specialize in one of these areas.

Courses:  Environmental Pollution:  Sources, Characteristics, Transport, and Fate; Scientific Basis of Environmental Regulation; Solid Waste Minimization and Recycling; Environmental Water Chemistry; Environmental Risk Assessment; Experimental Design and Environmental Data Analysis; Environmental Radiochemistry; Chemistry of Soil/Water Interface; Microbial Process Analysis and Modeling; Aquatic Toxicology; Reclamation of Disturbed Lands; Mining and the Environment; Molecular Microbial Ecology and the Environment

Pre-requisites:

• 1 year Chemistry
• 1 semester Physics
• 1 year Calculus
• 1 semester Statistics

Statistics can be made up at the school, but the others are required for entry into the program.

Total Cost of Attendance:  In-state:  $33,338; Out-of-state:  $47, 504
TA'ing:  Not required.  Highly competitive to get. 
Assistantships:  Include a stipend depending on how many hours are worked.  Also eligible for tuition, fees, and health insurance remission.  But these latter are not guaranteed.
Acceptance:  82% of applicants are accepted.

University of Chicago-Ecology & Evolution

The Ecology & Evolution department does not have a FAQ posted yet, so when that gets posted I should be able to update this with more relevant information.  Reading the Biology Department's FAQ, I came across the obnoxious statement that they do not disclose statistics of how many applicants they receive, average scores, GPAs, etc. of accepted students, and so on.  Although this is a top-ranking school, I didn't much care for it.  The price is so high, for one, though theoretically this is all taken care of by assitantships.  Information is hard to find because the website is so difficult to navigate, the ecology and evolutionary biology department's website is spare, and they aren't willing to give you all the info. you want and need.  They seem rather unfriendly.

Application Deadline:  Dec. 1.
Degrees Offered:  PhD only, but you don't need a Master's to apply.
Min. GPA:  None specified.
GRE scores:  None specified, but you do have to take the test.
GRE subject:  Not required, unless you apply for an NSF grant.
Total Cost of Attendance:  $48,920 (not specified if this is in or out of state or both)
Financial Aid:  The following comes directly from the biology FAQ:  "The financial aid package provides you with a stipend of $26,500 per year. Your tuition costs (approximately $48,920 in 2008-2009) and health insurance fees (approximately $2,600) are also covered in the financial aid package. You will also be provided with a one time $500 supplement to aid you in relocating to attend the Division of Biological Sciences Graduate Program at the University of Chicago."   Aid comes in the form of, "Predoctoral training grant appointments or research assistantships."
TA'ing:  Required to TA twice!  They offer a training course as well as a TA'ing handbook to help out. Areas of Emphasis:  None specified.
Courses:  Environmental Ecology, Natural History of North American Deserts, Prairie Ecosystems:  Lessons of Sustainability in the Past, Present, and Future, Tropical Ecology:  Biodiversity and Human Impacts, Biological Poisons and Toxins, Ecological Applications to Conservation Biology, Mammalian Ecology, Plant Development and Molecular Genetics, Intro. to Virology, Image Processing in Biology, Ecology and Evolution in the Southwest, Marine Ecology  (Note:  These are all undergrad courses.  They don't seem to have a listing of grad. courses.)
Pre-requisites:  While none are listed, the biology website states, "Evidence of a sound background in the candidate's intended field of study is important, as well as academic credentials suggesting that the applicant has the ability to pursue advanced study and research successfully." 
US News & World Report Ranking:  For all graduate ecology programs, it is ranked Number 1, as of 2007.

University of Michigan-Natural Resources and Environment

This sounds like an excellent program.  However, the price is outrageous!  $30,000 just for in-state alone.  

Degrees Offered:  MS, PhD  (must have Master's to get into PhD program)
Total Cost of Attendance:  In-state:  $34,571; Out-of-state:  $52,229
Prerequisites:  None!
Min. GPA: None that I could see.
GRE scores:  Test is required, but no min. scores are listed.
GRE subject:  Not required, as far as I can tell.
TA'ing:  (Called TI'ing here)  Generally, includes full tuition remission, health and dental benefits, and monthly stipend
RA'ing:  Tuition remission, health benefits, month stipend
The school also hires Grad Student Staff Assistants, who take care of administrative duties.
Areas of Emphasis (Master's): 

• Aquatic Sciences: Research and Management
• Behavior, Education and Communication
• Conservation Biology
• Environmental Informatics: GIS and Modeling
• Environmental Justice
• Environmental Policy and Planning
• Sustainable Systems
• Terrestrial Ecosystems 

Areas of Emphasis (Doctorate):  Resource Ecology Management, Resource Policy and Behavior
Courses:  Ecological Restoration, Sustainable Energy Systems, Wetland Ecology, Aquatic Entomology, Geology of the Great Lakes, Psychology of Environmental Stewardship, Soils, Woody Plants, Forest Ecology, Neotropical Plants, Biofuels Bio-Based C-Mitigation, Environmental Microbiology, Soil Ecology, Negotiation Skills in Environmental Disputes Resolutions

Potential Advisors:

Donald R. Zak, Ph.D. (microbial ecology)

Brad Cardinale (restoration ecology; loss of biodiversity; no publications listed)

William S. Currie:  (ecosystem ecology, sustainability)  Actually takes on new MS students every year, but is going to Sweden soon (for a sabbatical?  I don't know.)  http://www-personal.umich.edu/~wcurrie/index.html

Even has his own website about financial aid!  

http://www-personal.umich.edu/~wcurrie/About/MoreInfoStudents.html  

Inés Ibáñez, Ph.D.  (plant community ecology)  (PhD from Duke 2006, not very many publications)