My current 30 GB HD partions look like this:
500 MB MacOS 9
rest MacOS X
I did that because I decided to install all applications on the MacOS X partition even if they're OS 9 apps. That's because a ) almost all of my apps are OS X native now and b ) because I felt it was more sensible to have all apps in one directory rather than split on two partitions.
Hence, all I needed was the space for a OS 9 installation and some spare space for extra OS 9 system components.
Generally, I would stick to 2 partitions. A couple of years ago I had a partition for OS, apps, files/documents, and games. The problem was that it was extremely unflexible. At that time I was still gaming a lot and the HD sizes were smaller (a problem you probably won't face with 60gigs) and I had the problem at some time that one partition was full and the others still had space left.
Ever since I returned to max 2 partitions.
Under OS X it is highly advisable to have a seperate partition for OS 9 and OS X. And the OS 9 partitions shouldn't be too big (it doesn't have to be as small as mine either) since on the long run it's OS X you'll be using.
[Edit] I just had a problem with a smilie. b ) became
was better, I think...