I really like the UI design that Ubuntu Mobile is working on. See the images at UI wiki.

I see some similarities between what the Ubuntu folks are working on and what has been done with Canola. I'd really like to see something like this for IT. I've only had my n800 since last week but I've already started work on theming it to look somewhat like the Mobile Ubuntu wiki. I've never done this kind of work before though, so I'm learning as I go along (like FirebirdFeuervogel, I'm a graphic designer and I haven't done any UI theming before). There are aspects of the current IT2007 UI that don't work for me though and it would be nice to have an alternative.