http://www.macnn.com/articles/08/09/29/pdanet.tethering.app/
PDAnet allows tethering for jailbroken iPhones
updated 03:50 pm EDT, Mon September 29, 2008
PDAnet tethering app
A new option for tethering iPhones has become available through Cydia. PDAnet allows users to connect to the Internet on their notebook through the use of a jailbroken iPhone. Carriers generally charge an additional fee for this function, but in the iPhone's case, the option is not available; people are cautioned, therefore, that tethering may be against their carrier's terms of service, such as in the case of AT&T.
PDAnet has in the past been available for Palm and Windows Mobile devices, but the iPhone version is said to be the easiest, with no additional software required. PDAnet in general is claimed to work flawlessly with Windows, Mac OS X, or any other OS that can connect to a wireless router.
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Joined: Apr 1999
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Here's a replacement icon I made for this app, to replace the hideous one it ships with, if anyone's interested:http://homepage.mac.com/wiseweasel/pdanetiphoneicon.pngI've emailed them a copy, but haven't heard back...This app is incredibly easy to use. Just create a new WiFi network from your Mac (or PC), join that network from your iPhone, and then launch this app, and your Mac's got 3G or EDGE internet access. No software to install on the computer, and IT'S FREE! Best app of its kind so far.