This thread is way too long so if it was not mentioned already a GREAT site for DEMO DOWNLOADS is HERE:
http://gr.bolt.com/download/pc/pc.htm
and a very playable and fantastic game demo there is ONI; just scroll down to the O’s and you will see it on that site. I went and bought the CD after trying the demo and it plays great at 1024x768 on my Sony T250.
Its the only game I know with both hand to hand female fighting and a actually accurate shooter (3rd person); but you need a mouse for full control.
And for emulators ROMNATION is my choice:
http://www.romnation.net/srv/roms/genesis/s.html
I can get old classics like STREETS OF RAGE using two GamePro USB gamepads; that’s right; two players, as well as other Genesis games like Ghouls n’ Ghosts, Afterburner, and, well, you name it, they’ve probably got it, including other emulators like Playstation and MAME.