Thanks for help, darwinian. While that works for odd jobs, it isn't really practical for me as a regular/daily/multi-daily sync. Is there a way to create a "droplet" (I believe that's the correct term) that I can place in the dock, and then whenever I want to sync between OS X and XP, I just drag the folder/files onto the droplet, and that automatically copies the files to a temp dir, removes the ._ files, copies these files to a USB key, then deletes the temp dir.
I'm thinking AppleScript can do something like this?