What I'd like to see would be a replacement for the standard applications menu on the home screen.

It would display a row of catagory icons (Internet, Music, Applications, Utilities, etc) down each side and an area in the center where the applications in that group would reside with kinetic scrolling (Stopping at the top/bottom). You'd select the group and then the application.

Allow the user to specify their own icons for the groups and applications (to replace the small icons that sometimes come with the program). Assuming 10 application group tabs and 9 applications displayed per group would allow 90 programs with two presses.