I signed up for Yipit a few months ago and I am a huge fan. It compiles deals from Groupon, Gilt, Lifebooker, LivingSocial etc that fit my preferences and then sends them in one email to my inbox.
I found out about Bikram Herald Square in a Yipit message and I purchased kickboxing classes from a studio right near my office today.
Now that my Equinox membership has expired, I am going to look for more deals near my place of employment. I'll be more likely to go and will also save a ton of money.