a and s, those are the key which stick horibly on the keyboard of my old-old computer. d was a close 3rd and then b. WASD applied to it as well holy crud I think that old system was used to play counterstrike(lololol can barely run SNES 9x)
Shift, Enter, and deffinitaly the Spacebar.. and I dont know why anyone has said this yet, but 'a' my is faded, too. I always use a its in like all the words, okay not all.. but most of them!
"F" (most common key I would hit in random typing) "W" (move forward in most games) Spacebar (Jump, space, w/e)