The latest update to the iPhone, firmware version 1.1.4 has been released to the wild.
This update is no doubtable the update that will allow the soon to be released iPhone SDK to work with the device.
We are all very excited about the opportunities that the SDK will bring to iPhone software development
The guys over at ZIPHONE, are saying do not upgrade is you have a cracked iPhone. They are working on a new version of ziphone as I type this.