I've been searching for a quick way to turn on and off the WiFi and Bluetooth from the today screen since I first got my phones, and yesterday I think I found the most useful little utility in the shape of PocketToolMan 2.0
Find it here:
PocketToolman 2
It can put a WiFi and Bluetooth icon on your Icon Tray amongst other things, and i can turn either one on or off in 2 very quick clicks.

Oh yeah, forgot to add, I was originally searching for something free that would turn off the Sim Contacts on start up, which this does quite neatly