Go here to read about S2U2
http://forum.xda-developers.com/showthread.php?t=353008
The you will see
http://ac.xenpage.eu/S2U2-0.96-WM5.rar to download the file, it is in a .rar file extension so you will need something like WinAce found here
http://www.winace.com/down.html to unzip the file. Once you have unzipped the file there will be three files, you will see S2U2-0.95-WM5.cab this is the file you want to transfer to your Touch. Once you transfer it follow the directions listed above by
divxrippimp and you should be good to go. There is also a Readme.txt I would read the file because it explains the software to you and how to change the wallpaper etc.....