Good list Jason! I'm still here, and have been watching all the newcomers to the space with interest.

We've been providing our Nitro game mechanics platform to companies like NBC, Comcast, Hasbro, Warner Bros., etc. since 2007. We also have several startup customers and even a non-profit (Hope Lab - check out the cool work they're doing to combat tween obesity: http://www.uncommonprojects.com/uplog/2010/06/08/introducing...).

We've had 3 years of development, customer feedback, and on-the-job learning, so our platform's gotten pretty good, as has our team. And we have some cool stuff planned for the rest of this year and next.

Check out our website, and if you're interested in learning more, drop me a line. - rajat

"Nitro is the Participation Engine. It's also Patent Pending." (from the footer at http://www.bunchball.com/)

Hmm.

Is anyone here using any of these? I just signed up for BigDoor. To me, I think Reputely has the best website - I like how they use the phrase "game mechanics" since I already know what they are, and what the value is.