I went to the grand opening of the Apple store in Los Angeles last night, and I was able to handle the new 20 gig iPod.
I like the new track wheel. It feels good. It's definitely more solid. The center button doesn't rock like the 5 gig, and when you press it, you won't inadvertantly spin the dial, which happens to me often.
The clock feature is a little dumb. It doesn't display in the top corner like I expected. You have to go through a bunch of menus to get to it.. I wonder if there is a shortcut key. BTW, this display ipod's clock was stuck at 12:00:00. I guess the update isn't fully finished? I guess it all doesn't really matter; it's just a clock.
For some odd reason, I thought both the 10 gig and 20 gig were supposed to be thinner than the old 5 gig. Only the 10 gig is, and the 20 gig is actually a little bit thicker.
If I were to get a new one, I'd probably just get the 10 gig just for the track wheel and the extra portability (even if it is only a fraction of an inch.) My 5 gig scroll wheel worries me. I really don't need that much more space. I keep all my music on my external 120 gig, and iTunes 3's smart playlists makes it so much more convenient to sync. Actually, 5 gigs is enough. I'm hardly ever away from my computer more than a day.