High speed viewing

I don’t have time to watch or listen to much stuff anymore. On MythTV and on my PS3 I use a technique that speeds up the content, while adjusting the sound pitch to keep it from sounding chipmunky. I was recently watching an episode of mythbusters at 150%, and accidentally kicked it back to normal speed. It seemed like everything was going in slow motion. I boosted it up to 200% and was still able to keep up. 

I have other things that I’d like to speed up in this way. MP3 podcasts, MPEG videos, Realaudio streams, etc. I was wondering, does anyone have any programs other than MythTV that does this kind of acceleration with mp3’s and Realaudio files?