I've been using Ubuntu for a little over six months now, and am rather sweet with my setup.

However I feel like now is the time for a major overhaul, clean my system, teak it, install awesome applications, and just generally learn stuff to do everything better with Ubuntu/Linux kernel.

Please post below some links to things you have done with your setup that have made it faster, work better, look better and some applications that you wouldn't go without.