This has been brought up before and I just ran across this today and wanted to list it. It is a program to totally skin your today screen and it is pretty awesome. Here is the link to the homepage for this program and I have also attached the program.
http://www.lakeridgesoftware.com/products/
If you look in the forums on the website and search here in ppcgeeks, you will find many different skins and themes.. I am using a windows mobile 7 theme right now and it is pretty cool..