iPhone SDK Beta 3 came out last night. You can, if you're a registered iPhone developer of course, download it from Apple's iPhone Dev Center. The "Cocoa Touch Application" Xcode template now includes an xib file, and they've added a main nib file key to the property list file. There is also a nice new tutorial on creating Apps that use IB. The tutorial is not easy to find on the Dev Center web site, but they included a link to it in the notification e-mail that went out last night.