Haven't tried it yet (don't really need it) but maybe it'll help those of you on older computers? All it does is edit some registry values.. pretty nifty. Read the comments on the site linked if you run into trouble.
linky: Faster Ping | World of Warcraft Tools | Curse
hope someone finds this useful, seems like it'd be!
You also might want to try Zore's Reg Editing guide if you're looking to speed things up: http://www.mmowned.com/forums/wow-gu...educe-lag.html