I installed the Entrecard widget on July 5th and it has brought me 96 unique visits, 26 from ads placed on other blogs through Entrecard and 70 from other Entrecard users.

Out of all 96 visits, I have made a total of $0.26 from Kontera ad clicks and $0.13 from Google ad clicks from the Entrecard visitors. None on any other affiliate program.

So is Entrecard worth the time and energy it takes to drop cards and login and manage ad requests when you could be spending that time on other things?

This I am unclear on right now. I will continue to monitor the stats and see if it does anything other than bring me other Entrecard users. I have heard from other Entrecard users that they regretted removing the widget from their sites because the visitor count went down significantly, but is the traffic genuine users or just other Entrecard bloggers dropping cards?

Time will tell if its worth it or not.