8BitKid: Living Bit by Bit

So I am now an owner of the new “iPhone 3G”.  I picked up the white version (it matches my Nintendo DS), and am digging the high-speed internet acccess and location-based services.  The main attraction, however, is the application platform.  I love Yelp, Shazam, and a bunch of others that are really making the iPhone more of a tiny computer to me, and less of a phone.

Perhaps this exists, but one app I would love to see is one that turns my phone into a wireless modem.  Back when I was in college I had a Sony-Ericsson T610 that I could tether to my Mac and use to connect my laptop to the internet while I was taking the train to and from school.  With the iPhone, my understanding is that it doesn’t support OBEX, which is a bluetooth protocol necessary for dial-up networking.  However, the iPhone does have wifi, and I have seen apps using Apple’s Bonjour zero-config networking protocol.  It seems possible to create an app that would share my iPhone’s 3G data plan with my laptop via wifi.  I haven’t dug through my terms-of-use with AT&T, so perhaps this isn’t possible, but it would be incredibly useful.