Or you could just get Quicksilver and make your dock redundant. Tomm, it will run fine on your Powerbook, and you can keep everything if you "Archive and Install" (which is on the screen when you choose the hard drive you want to install it on, just click "Options" and choose Archive and Install, will preserve your files, network settings, and everything, and makes a folder called "Previous Installations" with your old OS files in, incase you need something)