I have joined SezWho, http://entrecard.com/blog/?p=444%20.
They are currently running a contest to award 5,000 credits to anyone who follows the rules on the Entrecard blog site listed above.
This is a comments-based service that applies Entrecard credits by commenting on other blogs about SezWho. I still do not understand how I use credits, but I imagine with enough I can host ads, or purchase goods?
I still need to read the EntreCard User Guide to suss all of this out.
I will let you know about my progress... It sounds interesting and will certainly get the conversation going!