I have the same issue, but i didnt move, things just got slow for no reason. I'm thinking of redoing my machine and going to try 3G on Linux. I got a feeling its a windows related issue. I run a pirate WINXP at home (who doesnt?) and I reckon MS has found a way to screw your machine up if its not a registered copy of WIN. Maybe? Nontheless, I dont want to use windows anyway, moving to UBUNTU, its great and ITS FREE......EAT THAT BILL GATES!!!
Ok, so read my post about getting my 3g up on the AMD64 Linux box, the damn connection is so much faster now, must've been crappy windows, thats the only variable here, using the same card, same location