When I first started working on my NES emulator I had set my target at being able to emulate Super Mario Bros. and now I can happily say my emulator can do just that. Running SMB is pretty much glitch free (and audio free, but I'm okay with that) at this point and can be played start to finish without any issues, so I am officially tickled pink. It can also play quite a few other big name titles; in fact I would estimate that around 80% of the games it has the mapper for are playable.
A few games running in Emu-o-Tron
I added the ability to "rewind" games using save states which is really fun and a nifty looking effect and I'm now dependant on it to progress in games I'm testing, it can eat up quite a bit of RAM depending on how long of a rewind buffer you want and how smooth you want the animation to be but I think it is worth it. There are now quite a few new frontend features, it supports Xbox 360 Controllers thanks to GLORIOUS SlimDX, it uses the 7zip library to allow it to play ROMs that are archived, you can finally rebind keys, and it supports using Scale2x and Scale3x display modes which it actually manages to handle while still maintaining 60FPS.
Super Mario Bros. in Scale2x mode