Just found a cool new shortcut, you can quick preview any file by selecting it and pressing the space bar or Command + Y

Using Alt + Command + Y you can start a diashow with the selected files (pics). On a Win keyboard it's Start + Alt + Y

A really useful shortcut is pressing Enter (return) key when an item is highlighted and then you can rename.. So you don't have to Right Click, I mean Alt-Click, and press rename! :)

You can also do this by clicking the icon first and then and click on the name.