Switching from PC to Mac.. anything you wish you knew?

Macs have had right-click support for many many years now and Apple mice have detected right clicks for years too.

The Apple magic mouse I use will (without any visible buttons) support left click, right click, scroll 'wheel', forwards, backwards and provide switching between full screens apps and access to mission control.

For productivity work I find it the best mouse I've used, but if you're a gamer or need a middle button click then look at a different mouse.