Ask YC Poll: Which is your favorite YC startup?

The range of YC startups has become quite broad. I thought it would be interesting to see how their popularity varies within the hacker community. So lets try and design a poll.

Rules: Vote for only one launched YC startup and don't vote for the company you work for.

Mechanism: If your choice is present, vote it up. Otherwise submit it in a new single line comment. If two people end up submitting the same name at the same time, the lower one should delete their comment.

Karma issues: If people feel that the person to submit a new choice first shouldn't be getting all that karma, then the mods could just remove karma for the top choices once the post is no longer active.

Finally, the list of launched startups is at the top here: http://ycombinator.com/faq.html

Edit: Please use the poll choices for voting only. The place for discussion is at the bottom where a special -1 karma post has been created.

Edit: I don't think you need to be bound by any particular criteria for voting. Design, success potential, personal appeal are all valid. For example, I haven't even used the site I voted for. I was just very very impressed when I visited it recently.