That's obnoxious. You'd think that the OS could peg those swapfiles as contiguous when it creates them before there's any additional data. Is there a defrag utility for MacOSX that you're aware of? (I've been meaning to clean up my filesystems anyway.)
Well, it creates the swapfiles as needed and destroys them when they are no longer needed so there isn't really any way that I can think of for them to guarantee contiguous space for them (without a dedicated partition). I do think it is pretty rediculous that Apple hasn't come up with an automatic way to defrag the filesystem yet though. Maybe once they get their journaling enhancements a little more final. As far as a defrag util, Techtool Pro and Norton Speed Disk are the only options I know of.
-Mike