For setting up a partition as a swap file in PS, you don't have to remember anything. In PS you designate where PS should look for more swap space (beyond RAM), I simply designate that partition (on my current system, 7gb) as the place. Doesn't mean I can't piggy back on that space if I need to (which I do at the moment) its just that PS works faster if the swap space is one contigous area. And I do have 1gb/RAM, which is great, but I sometimes work with 60-75mb files, and every layer in PS mutiplies that.
I like the partitions if for no other reason that organizing my life. On the non-apps drive, I have one partition for documents and business files, another for images only, another for graphics, web pages, video and music, and the last was the PS swap file. When I do the upgrade to the 120gb drive (as a second drive) I will proabably put the PS swap space on the primary drive and still keep the 4 (or more) partitions on the 120gb drive. The photos and multimedia just eat up the space.
Andy Pearlman Studio