There's a new post on the Sony blog showing off some pics (which might not be that new) of the various video/music and photo features in action. Aside from the slight clutter of all the option buttons on the side of the browser (which hopefully autohide). It all looks pretty clean and attractive, the touchscreen will definitely make things easier over the PSP's feeble efforts.
As for the interface, there's a nice glow effect on all the play bars, and the resolution of the screen gives everything a super-crisp look. Just need to wait until everyone gets their hands on it for the ultimate verdict though.