byuu says (in the public announcement):
I'm releasing a beta version of bsnes, for the purpose of gathering feedback and
ensuring that the first official release of bsnes is as solid as possible.
With the exception of dynamic rate control for automatic audio/video sync, and
no pack-in video shaders or cheat code database, it is mostly feature complete.
However, please do not form a lasting opinion of bsnes based on this beta.