I know I'm way later than I should be, but at long last I'm learning all sorts of useful command line stuff. For instance, if you've ssh'ed to a machine and you're running ubuntu over a virtual machine, do you know how to shutdown? You type shutdown! I know, why didn't I think of that. It's actually: sudo shutdown -h now
Another terribly useful thing I've finally learned about: MacPorts. It definitely gets added to my list of useful mac software. It's like synaptic but for macs. If there's something you want to install, for instance player, you type:
sudo port install player
Then, like magic it finds all the software that player relies on and installs them for you before installing player. Brilliant.