We just spent two days presenting Listia to investors at YC’s demo day. It was lots of fun and we met tons of cool people. Here are some recent articles from the event that mention Listia.
http://www.techcrunch.com/2009/08/19/silicon-valley-elite-flock-to-y-combinat…
http://mashable.com/2009/08/19/listia/
http://blogs.wsj.com/venturecapital/2009/08/19/low-points-and-screw-ups-y-com…
Also, we have been getting some great feedback from everyone regarding the service. it really helps us iron out all the kinks, so keep the emails coming!
The Listia Blog 
You are paying for the rewards with your YC money? I can’t wait to see what we get after you raise an uber-angel round.