Tether For iPhone Returns As An HTML5 Powered Subscription Service
While most of us are still trying to figure how iTether temporarily snuck into the App Store, the developers behind that software have returned with a new version that skirts Apple's guidelines entirely. While Tether.com has standard apps available for BlackBerry and Android users, the new approach on iOS relies on creating an ad-hoc network from a PC, and then visiting the appropriate webpage on the iPhone. Log in to the website, and the company's "patent-pending" software does the job of tying the two connections together wirelessly through the magic of HTML5, no jailbreaking or other hackery needed. The cost for the service is $30 a year, although it's currently available for the first year at $15.
Note that there is no free trials/demo version of this software and what happens to your data plan is between you and your carrier. For more details check the company's website.