This is pretty excellent. Check out the demo. This is a new flash-based contextual help app. When you click a tool, you see two tabs--one is an Adobe tab that shows related Help topics, the second is a del.icio.us tab that shows helpful links (e.g. Tutorials) from delicious. They're using a single del.icio.us account to feed this tab.

To check this out in Illustrator CS3, go to Window > Adobe Labs > knowhow.