I used the "HTC Wi-Fi Sharing.cab" on my TP2 for a couple of months and it worked great. I was getting download speeds of around 1MB consistently. It turns your TP2 into a wireless hotspot and then you just connect to it like you would any wireless connection. Of course, your computer has to have WiFi...
Its been posted in several places around here. Here is one of them...go down to Post#9
http://forum.ppcgeeks.com/showthread.php?t=107596
(BTW I sold my TP2 so I could get a Samsung Epic.....can't wait!!)