Do you use Mac OS X Leopard or above? Do you know the shortcut Apple-? (Command-?)
Give it a try. It will increase your productivity for sure.
Currently I’m using a windows system at work and think about switching to a Mac. Some peers are using Macs already. In a pair programming session I stumbled about the fact, that you can not navigate directly to the menu entries. Pressing Ctrl-F2 and then using the cursor keys or start typing isn’t to best choice. I remembered that Neal Ford told me (The Productive Programmer) that you can reach any menu entry by pressing Apple-?. Next start typing the name (or parts) of the entry you are looking for. Select the one you’re looking for. Press Enter and you’re done.
Screenshots will follow after I bought me a Mac:)

Macs sind überbewertet … if you want to increase your productivity.
And Java sucks.
In my post I just mentioned one shortcut that is increasing your productivity on a Mac. It is like Ctrl-C, Ctrl-V. These two shortcuts increase your productivity as well and a lot of people use these. But first you have to know them. Nevertheless, if I compare Windows XP (this OS I use at work) to Ubuntu or Mac OS X, than XP is on 3rd place. But I don’t want to start a blame-war.
Which languages do you use? At least when you use IntelliJ IDEA writing java code can be a pleasure.