It has been a huge productivity boon for us, so I wrote Hg Init, a Mercurial tutorial-check it out!

The text fields for labels can be customized, so they can be a big productivity boon:

Auto save and auto resume for documents and apps weren't demonstrated during the event today, but they are both features we were hoping might be coming to Mac OS X. After becoming accustomed to them in iOS, they could be a productivity boon on the desktop.