When creating an "OS & apps only" Drive, what folders to move or copy?

Hi - I have a simple two drive set up on my G5, one for data, one for Applications & the OS. I think I've left too many items on the App & OS drive, and am wondering if you can tell me what else I should move. Or put another way , what standard file or folder names should be included in the OS & App drive, and what can be safely moved to the data only drive. . I've searched around the forums, MROOGLE, but with no luck...

Here's an attached screen shot of my finder. the drive named "macintosh HD" is the drive want just for OS & Apps (not sure how to imbed the image right in the posting) It's the original 160GB drive that has only 35GB of space remaining. What can be moved, and will it make my machine and apps boot more quickly? Thanks

 

ok..so move the itunes and iphoto libraries to the data drive? Thanks