Vince has the right idea.
What I REALLY want, is this:
but with a hard drive (5GB would be good. 20-40GB would be better). And WiFi would be cool too.
Some hardware buttons for controlling the media player would be nice. But I’m sure a good “media mode” system could be delivered (with a low-power music-only mode).
You build that… and a smaller i600 size version (no keyboard, flip phone, smaller screen)… and you’ll change the world.