Quake 2 and 3
 

http://sites.google.com/site/quake2android/

http://code.google.com/p/kwaak3/

Just thought I'd share, both run more then playable on the droid. You OCed guys will probably have a better experience with Q3 though.

VIDEOS:

http://www.youtube.com/watch?v=m7iYtH9iqYo

http://www.youtube.com/watch?v=q9Xaz7ECI4M

Have fun! :headbang: