Yesterday, NullRiver released NetShare (App Store), a $9.99 application that lets you use your wireless signal on your iPhone on your computer.  A process knows as tethering, even if it’s done over wireless.

That application was mysteriously pulled down by Apple late yesterday. According to TechCrunch, the application has reappeared in the App Store. Tethering is something that most smartphones can do but is something that carriers generally charge extra for.

We suggest that if this application is something you might use that you grab it now as AT&T is likely to ask Apple to take it down. Here’s a quick tutorial to help you set it up.

If the application stays up in the store we’ll post a review soon.