Just a quick head-up: iH8sn0w is working on sn0wbreeze 2.0 which will support iOS 3.1.x/4.0/4.0.1/4.1b1.
custom iOS 4.0
Posted inVIDEO
First Look At Sn0wbreeze 4.0 For Windows [video]
Because we got a few hundred emails about Sn0wbreeze , especially since the iPhone DevTeam released PwnageTool 4.0 , we decided to make a video and demo the tool , optimized for iOS 4.0 .
Posted inHOWTO
HOW TO: Create A Custom iOS 4 Firmware Using PwnageTool 4.0 [video]
The iPhone DevTeam just released their new version of PwnageTool, which allows us to create custom firmwares for our iOS devices.