Wufoo is a super-nifty form building tool that also has dinosaurs and ninjas. It’s extremely easy to use, and very powerful at the same time. A long time ago, we created a hack that allowed MailChimp users to sync their Wufoo forms with their MailChimp lists.
The hack was nice, but Wufoo has since made this functionality more — ahem — official:
This is a fast, simple way to build a contact form for your website, or a collection form for a giveaway, and "connect" it to your MailChimp account. Wu-hoo!