Edward Tufte is reknowned for his books and articles on interface meets design meets data presentation. (search his site for the article PowerPoint and businesses)
Anyways, he just put up a posting on what the iPhone does right, and a few things he thinks could have been done better.
(make sure to check out the video link in the article for an actual demo)
And speaking of interface, with the new moveable home page icons, here's my latest first page setup:
After going through several iterations, I've finally moved my frequently used icons to the upper-right hand corner. This provides quick access for my right-hand thumb.