The iPhone Dev Team has just released PwnageTool 2.0, thus bringing jailbreak and non-App Store third-party application support to iPhones/iPod Touches running firmware 2.0. First-generation iPhones can also be unlocked. At this time, the iPhone 3G cannot be unlocked or used with BootNeuter.
Erica will post more details later tonight or tomorrow, and the Dev Team promises a more detailed announcement soon.
As always, be cautious if you decide to install PwnageTool 2.0 and make proper backups of all of your data before proceeding, understand that installing software like PwnageTool is unsupported by Apple, blah blah blah.
Thanks to everyone who sent this in!