Blimey, two Cowon D2 posts in short-succession. I just came across these videos of the UI in action thanks to the camera-work of Cowon Systems employee Kevin Kang. Three clips, a starter introducing you to the menu structure and layout, then a more in-depth look at how it's usable with both stylus and finger, with a final video covering multi-tasking (impressive) and performance of internal flash memory versus SD cards (also impressive).
Video three is after the cut.
I'm hoping there's movement in bringing the D2 into markets outside of Korea, it truly looks impressive and I'd far prefer it to an iPod or Zune.