Take a look at http://www.trenchmice.com/. It’s a new site which I’d describe as an “enlightened” version of www.f*edcompany.com. One major difference is that people are encouraged to post about not only companies where bad things are happening, but also about companies where things are going well. Furthermore, there’s a clever community moderation system which keeps track of how much “cred” users have and gives individual users more or less influence over the content of the site based on their cred. It looks like a rather clever concept, and if it achieves enough critical mass that it’s possible to learn something about a company or even a specific manager before going to work for it/him/her, I think it’ll be quite successful.
If you register on the site through the link http://www.trenchmice.com/trial/ts60/, you’ll get a free 60-day “gold” membership.