I've been using this program for over a year now
It basically accelerates all running programs to the speed you want. Works great with single player games, sometimes you can even speed hack cheat with it online.
It also accelerates flash and any other windows programs, although it does not speed up videos nor mp3s.
Great program, download it @ http://www.hot-shareware.com/speed-gear-download.html
You can PM me for a "patch" that will fix the limited usage problem.