Be very very carefull. Because there are so many fake web sites came out recently. Do not trust names like quickpwn.com. There sites pretend to be DevTeam. Applications that those sites give you might be dangerous for your iPhone. Some sites ask for donations. Remember DevTeam don't do it.

There is only one DevTeam's site: http://blog.iphone-dev.org. When I publish news about some new version of QuickPwn, WinPwn, PwnageTool and etc, I use links from DevTeam's site. Everything else could be harmful fake.