Since making the move to Mac, I have discovered and installed some programs that I’ve found quite useful. Here’s one I use every day.
Cinch is a window manager that emulates a feature from Windows 7, which has some nice UI innovations (!). With Cinch installed, you can drag a window to the top of the screen, and it zooms it to fill the screen. The nicest part (which I don’t think Windows does) is that if you drag a window to one side of the screen, it fills exactly that half. Tremendously useful on laptops. Seven bucks, totally worth it.
Emery Blogger 
Well, I used to use a scriptable window manager to achieve this. Before switched to Compiz, I used SawfishWM. You can write scheme extensions to control the behavior of the windows, like binding a keystrokes to maximize or vertical split all the windows.
And for laptops, I would always prefer keystrokes to mouse actions. Maybe it’s because my trackpoint moves slower than touchpad. 😦
Another window manager for the Mac that I have been using for a while is called SizeUp, which is heavily keyboard driven.
http://www.irradiatedsoftware.com/sizeup/