

Candidates:
RK Launcher
+ Slightly better than others on CPU & RAM usage, very flexible (YZ's Docklets and some others)
- Memory is not released after configuring the program/docks

Y'z Dock
+ A lot of available docklets
- stopped, due to Apple's request
RocketDock
+ Plain fast and efficient, user friendly
- Memory is not released after configuring the program/docks

ObjectDock
+ as resource friendly as others once configured and has lots of available docks
- not much to say here
note the shareware Plus version that adds many useful features
Mobydock
+ I love the name

- developpement stopped, I don't like the unhiding>zoom transition
I chosed RK Launcher for its slight better RAM/CPU usage (manually tested, on similar configurations - nothing scientific though), the available docklets (Mail, CPU/RAM History, Weather, HD, WallPaper, Screenshot...) and the fact that it is under developpement. Memory usage is between 4MB and 9MB, depending on the docklets loaded as long as I restart it after reconfiguration. It's convenient, eye-candy and not too heavy on resources... Recommended

Then, you have to play with it:
- Docklets: on dockex and WinCustomize
- Icons: WinCustomize and in many other places (look for Icons or for 128x128 PNG Alpha images)
Olivier