Thanks for submitting! The number of responses is vastly more than I expected, pushing 100k uniques now. AppEngine has handled it wonderfully. It blew past the free quota, so I did have to enable billing. But, it's still only pennies so far, and a quota reset is coming up soon.

The amount of data has been a challenge, since I have to put together more efficient stats tracking. A good problem to have, of course.

I was expecting to have to spam the crap out of my Twitter feed and leave links everywhere to get even 100 participants. Glad that wasn't the case!

This is where Appengine shines - it scales painlessly, so there won't be any hurt (apart from being billed for the resources).

This scalability comes at the cost of a wee paradigm shift from relational database to datastore mindsets, but is well worth it. Developers can do what they do best instead of having to become system architects and admins.