There have been at least a couple times so far that I've wanted to comment on some of your twitters.
The whole "cover flow" twitter you posted with a question, at that, urges me to comment all the more. I vote for comments on twitters!
As for cover flow, I don't think I've used it on the iPod. On my iTunes, I like to have the song list on the bottom of the screen a graphic of the cover on the top of the screen.
Now that I think about it, it would be cool if you could get the rest of the album art along with the cover for songs/albums you buy on iTunes. Album art is something I'm sure I'll miss while switching from concrete albums in hand to digital music.