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yone use glassdoor.com, the "yelp" of company reviews?

It's a great site and I've been using it for the past 2 years. Really good tool when deciding to switch companies and debating if the offer you got was really worth it. Check out payscale.com as well.
It's a good site; however, be mindful of reviews for smaller companies. One disgruntled person can skew the results. Also look for trends -- my company went through a "time of troubles" a few years back, and reviews from that time period are understandably negative. Most if not all of the problems of that time have been addressed, and so more recent comments are much more positive.