Apple Releases First Developer Preview of Mac OS X Lion, Announces New Features - Mac Rumors: - Versions, which automatically saves successive versions of your document as you create it, and gives you an easy way to browse, edit and even revert to previous versions;
- AirDrop, a remarkably simple way to copy files wirelessly from one Mac to another with no setup;
- Resume, which conveniently brings your apps back exactly how you left them when you restart your Mac or quit and relaunch an app;
- Auto Save, which automatically saves your documents as you work;