Hello there:
I had the same dilema when I purchased my Dell Axim X30 high as I previously had been using the Palm IR keyboard (not universal) with my Tungsten E.
I've not tried it on WM5 but on 2003SE it will work perfectly. Go to the ThinkOutside website (
www.thinkoutside.com) and download the driver for the universal keyboard. Install on your device and then start using the palm keyboard.
They are really the same keyboard except that the Palm IR has palm-style icons for the applications but they will take you to the same corresponding app on your Dell.
Hope this helps.