My college is mostly Mac Pros, about 85%, and the PCs are all custom maxed out HP towers.
Here's the newest Mac Lab that me and my friends mainly pull all nighters in:
I took this last night. These are all Quad-Core Xeons@2.26GHz, NVIDIA GT 120 & 8GB RAM. These are the only ones at this campus to have the new 27" Cinemas, the rest use the previous 24" Cinemas (I think they may be matte as well), the ones at the DMC have them as well.
You may also note that all of us have MacBook Pros (mines is the second from the closet one, with my friend using my D80).