I came back from vacation with a bunch of stuff to print, but found that they had changed network printing from AppleTalk to IP/printserver. So I set up the new printer, but had all of these jobs left over on the old printer.
I was looking for some queue directories so I could drag the job document from one printer queue folder to another (like in OS9). I then found that I could just open the (old) job queue list in Print Center and drag the jobs onto the new printer. This is nothing revolutionary, just a nice feature I didn't know was available.
I don't know what limitations there are if your two printers are vastly different (postscript vs non?), but it works beautifully when they are similar.

