Further proof of what I always preach...when I tell you about another great deal site sign up (especially when they are offering up credit for signing up). I had just read where someone was emailed a unique code for a $10 Free credit for Groupon good towards their first purchase.
I just checked my email and I had a unique code for a $5 credit towards my first purchase.
This appears to be only for people who have signed up already but have not yet bought anything.
Obviously I can't validate this b/c I have bought from Groupon many times :)