I saw this mentioned in another thread, took it for a spin, and thought it was an AWESOME resource for anyone wanting to see other people's opinions of their assigned test center. You may not think it's important, but knowing the temperature of the room you'll be in or the size of the desk you'll have to sit puts you at an advantage--there are no surprises for you on test day. Also, if you haven't yet selected your test site, you can use this to pick the best one.
Check it out:
Kaplan Test Site Rater --
http://www.kaplansurveys.com/rater/