That looks really cool too. One of the things that annoyed me about Sparked was that it seemed like people often didn't understand that the requests were only supposed to take 15 minutes. Is that true for Catch A Fire?
Catch A Fire asks for a lot more time, 10-50 hours. It's a genuine commitment to provide your skills to non-profit causes who otherwise would use (scarce) funding for professional assistance.
Also look at http://catchafire.org/ (something similar)