Ubuntu Mobile Internet Device (MID) Edition is the latest offering by the folks over at Canonical. It is a fully open source project which aims to bring the internet into modern mobile devices.
Features include:

Full Web 2.0/AJAX fidelity, with custom options of Adobe Flash®, Java, and more
Outstanding media playback so you can enjoy videos, music and [...]

Here’s another reason why I’ve always been interested in running Linux. Lifehacker has posted an article on how to get your iPhone / iPod Touch to sync wirelessly with Linux and in this case, Ubuntu Hardy Heron (8.04).
Via Lifehacker | iPhone: Sync Your iPhone Wirelessly in Linux