Nice collection! I've been getting more and more people asking where/how to learn to code (good for them, they're gonna need it). I knew the big ones and the ruby-focused ones, but nice to have somewhere to send them.
The social shopping thing looks like it will be pretty big over the next few years. This looks like an interesting implementation. How hard is it to integrate this into an existing site?
Scott, I looked at you guys the other day, and I couldn't see what you did that launchrock and unbounce didn't, but for free.
LaunchRock adds the social validation thing. I'm not sold on their thinking there. (I'm using it to find my target market, which means I'd be ok if they were just able to track IF they shared, not how effective they were).
Unbounce has better reporting than launchrock, and some nice templates, but their social contest pages are smoke and mirrors. You can't determine if anyone shared w/ them either.
Both are free to try though. 50 signups on someone else's domain is simply useless, unless you're anticipating failure.