How to share Shareware iPhone Applications?

If you wish to share your purchased iPhone software with your friends and family, then you will be glad to know that there is a trick that allows iPhone users to share their purchased software with 4 other users. The iPhone's Fairplay DRM Technology allows you to authorize up to five computers to share iPhone software purchased via iTunes. Here's how you can do this:
Purchase and download any software from Apple App store on you computer using your itunes account and sync with your iPhone/iPhone 3G.
Login to the iTunes application on your friend's PC with your iTunes account. Logout and Log back in again. Find the application that you purchased earlier, click "Buy" and download it.
Logout of your iTunes account and Login with you're your friend's iTunes account and sync your friend's iPhone/iPhone 3G
Jump over to allforces.com to read about this in detail.
Source: Into Mobile