I just found this site and it has almost all the old nes games I can think of/remember. All in original 100% accuracy! No buggy, crappy, kid made games. It's like playing nintendo over the internet!
AWESOME!
http://nintendo8.com/
Adventure Island 2 (The one where you mount dinosaurs!)
Tiny toons adventures
Contra
Duck Tales 2
Top Gun
Urban Champion
THIS IS EPIC NOSTALGIA!
I'll add more as I go...