There are some free apps on the Mac App Store nowadays, so there is no need anymore to manually create ringtones from music files in a multi step error prone process. I use iRingtones for this purpose.
There was one thing driving me nuts working with the Apple spreadsheet application Numbers, which was introduced with iwork 08. It’s trying to edit a table cell without using the mouse. When you worked with Excel before, you are used to just press F2. But I couldn’t find a keyboard shortcut to do same in Numbers. But there is one, although it was hard to find in the documentation:
Press Option (Alt) + Return to edit the value of a selected cell without having to use the mouse to click the cell.