Apple just dropped an update for the Remote application for iPhone/iPod touch. Remote.app allows you to control any iTunes library (or Apple TV) over a local WiFi connection. According to the release notes, you will now be able to create a Genius playlist, and create/edit playlists in iTunes.
This application (and its update) is a free download from the iTunes App Store. Take a look at our gallery of screenshots below. And be sure to sound off in the comments if you notice anything different in this version!