Time for an update. Today I went through and re-did my McAfee BUP file decrypt-er thingy. I got rid of the guy with sunglasses, modified the decryption sequence to cut off the first 2048 junk bytes, added drag-n-drop capabilities, and added a hex view.
I guess this looks more professional. You can download it here.
Anywho, happy hacking!
Edited to to censorship