I recommend looking at BetterTouchTool http://www.bettertouchtool.net (free) and Alfred http://www.alfredapp.com (free without the Powerpack). I start all programs with Alfred and use BTT taps/movements on my trackpad to arrange/resize windows. I used to fire up applications with spotlight but alfred feels much quicker + I can create lots of custom web search queries which I use all the time.

Loving this thread and the one from around two and a half years ago. I'm probably missing out on a few things as I'm still running 10.6.8.