As a 755Newbie, I'm a bit confused (not an unusual state). The Sprint CSR was completely unable to help.

Clearly the 755p can be used as a modem, with a Bluetooth link to my laptop and good speeds. This seems super, BUT:

1. What is the cost assuming that I have free Power Vision? I get the sense that occasional use involves no cost, but "tethering" is expensive. What's that? At what point am I doing that costly thing?
2. I understand it requires either a hack or PDANET software. Where is a comparison of these? In fact, where is that hack?
3. Is there a tutorial somewhere, or a discussion group focused on using these Treos as modems?