Ninja Gaiden, Street Fighter 2, Contra, Tiger Heli, Super Mario Brothers 3
My personal favorites.
Although I do have a peculiar addiction to Donkey Kong which puts me in front of my NES more often.
And as far as the concern of aging systems, I feel your pain, mine can be frustrating to start up and work at times. Clean it with an airgun? Resolder connections? Anything?
I am relatively sure that if you hack your x-box there is a source where you can download all the original Nintendo games. But truly, nothing can compare to the experience on the original platform, hammering away at those little rectangle remotes... (sigh)
-AndrewP
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Go Fishing. Go Ride.