You can also now easily purchase supplies for your printer right from the Mac OS X print dialog. From Apple's store of course.

Surprisingly it works very well talking to a network shared Windows printer. My only real gripe is that it doesn't let you type in the server name if the server does not show up in the list of available servers.

This can easily happen if your Mac is configured for a different workgroup than your PC(s). And it is not immediately obvious how to change the workgroup on the Mac. The Windows workgroup is not specified in the control panel but rather using the utility "Directory Access"  under its SMB/CIFS configuration.

VoiceOver is a new accessibility feature that enables the Mac to speak the text of selected items in dialogs and actions that occur.

The Automator is a handy way of pulling together applications within the GUI.

Formerly called "Limitations" the new "Parental Controls" provide extra ways to lock down applications, such as limiting who a user may chat with using iChat or send e-mail to.

You can now create special "burn folders" directly from the Finder. These folders can then be easily burned directly to a CD or data DVD.