I did a clean install of Windows 7 this weekend. It was long over due as my previous install was an in place upgrade from Windows Vista. A couple of things I noticed. The system is much snappier. The boot time decreased again and is now at 0:57 with all the same stuff loading as before. I also noticed a nice increase in overall disk performance, particularily with write performance. Take a look and compare to before.
Also my WEI increased a little. Disk performance use to be 5.9 and remained unchanged after installing the Synapse drive. After a clean install it went up to 6.2, a small insignificant increase but it is something.
PhotoShop opens in a blink of an eye now. WOW, BF3, and Skyrim all open 2-3 seconds quicker too.