Which start-up inspired you most in 2010?

Fee

Groupon refuses to inspire me. I am amazed at their growth, their adapting from ThePoint and their billion dollar valuations but I just don't see it as a viable business model Case in point, the two times I have bought such deals it was from Living Social even though I track Groupon every day.

So back to the original question, what inspires me is not one particular start up but all the open source contributions that are enabling these start ups including mine. It just wouldn't be possible for someone like me (full-time Windows dev) to bring my ideas to reality if not for the Ruby on Rails framework, jquery and the countless number of plugins.