Thanks for the replies, everyone. A couple people have suggested that we put this on the wiki to replace the old, never-updated PoweredBy page (maybe as UsersSurvey09). I'll pull the _public_ responses only into a wiki page later this week; if you replied to the list but don't want to be on the page, let me know in the next couple days and I'll leave you off. And of course since it is a publicly editable wiki, you can always remove yourself later too.
-Jonathan
