nice and easy to get, simple to use: can go up to 300x speed, but anything over 30x will probably get you kicked off because the server can't keep up with your location, this isnt "detectable" but it's pretty damn noticable, so don't do it with too many around :P
http://www.download.com/3001-2121_4-10512198.html
You get to use it 50 times before it un-trials, but I can crack it upon request, enjoy!