I have created a new application for Palm (and other PDA or MP3 player users). I got the idea for it when I realized the 35 or so songs on my PDA (that I painstakingly chose from over 5000) would quickly get tiring, and I would need to cycle the songs on the unit often. But since it was such a chore the first time I kept putting it off, and listening to the songs I already had on the unit. That was when I realized this was a great opportunity for a new application to do it for me. The Palm Random MP3 Loader will allow you to select a directory of MP3s, choose how many megs to transfer, choose the largest single file to transfer, and the path to your SD card (or you can choose to xfer via the normal HotSync).
Here's what the interface looks like:
More info on the app is here:
Original thread about the app on BrightHand Download link and my PowerUsers.info forum thread on the app