Agenda Calendar is a gesture-based calendar app for your iPhone or iPod touch (our review here). Agenda features a very minimal interface, presenting your data in a simple, straightforward manner with a few animations here and there. There is some intelligence built in as well, giving you links to maps and other things within the app.
It's very nicely done and should appeal to those who like a no-fuss interface. Check out the demo below for a preview.