Earlier tonight the Dev-Team released the iOS4 jailbreak for iPhone 3G and iPod Touch 2G. Still no iPhone 3GS or iPod Touch 3G support but it shouldnt that long before those devices will be supported.
Download redsn0w<ul>[*]Mac[*]Windows[/list]
<a href="http://dailyiphoneblog.com/2010/06/22/jailbreak-iphone-ios4-with-redsn0w/">

[Read the original blog post]
</a>