I just found out about Entrecard's new paid ads when I logged in the other day. I really wanted to support the effort. I didn't take too much away from what I already have with them anyway but after reading a few articles (both pro and con) and reading a few threads about it on the Entrecard's forums, I'm ready to quit.
I had submitted a ticket regarding unapproved ads that are still cycling through my widget but haven't heard back from anyone yet. I'll give them until Sunday then I'm taking my widgets out too. Like Krista said on a previous comment to this thread, the little traffic that comes from Entrecard was never of any quality anyway. They always just drop and run.