I'm using Nuonsoft ShellEnhancer... it works great and with lots of functions (roll-up, windowstate based transparency, minimize to tray, mouse gestures, corner hotspots, automatic management of windows, etc.), I'm surprised it is freeware.

Also, look into WinTiles (www.wintiles.com). Its a shareware app which resizes windows to ensure each pixel of your desktop is used efficently... definitely reduces the number of times you have to hit the maximize button. Not sure yet if it works beyond the 30 day trial...