For anyone interested in improving your skills check out these videos. I already used some of these to an extent but I didn't realise just how much you can do.
Hotkey Mastery
Control Groups
All of them can be found here:
http://starcraft2.ign.com/wiki/StarC...ideo_Tutorials
I suggest the scouting videos as well. He mentioned a couple of neat tricks that I hadn't though of myself.