[tsbtx]

If you use the software your carrier provides, be prepared to pay for it. And it's not exactly cheap.

If you use the .cab installer, or even better, write to a ROM that has it built in (I.E. not the stock carrier ROM). Carriers disabled the free internet sharing that Microsoft made for the phone, but the pure awesomeness of the geniuses here have made that all the easier for lay-people like you and I to make that a problem of the past.

But there are threads for that as Frazell said, so I'd take advantage of them.