mrflip

open_id_doodads

Let users with open_id provided by major sites (livejournal, blogger, wordpress, myopenid, etc) to just type their username insted of their full open_id url.

acts_as_pimp

Generate little sidebar doo-dads to pimp that page on reddit / digg / etc.

dynamic_snippet

Use javascript and a small client cookie to generate a dynamic-content snippet ("Hello, -username-") on a fully page-cached site