Font Collector is now Free (GPL) at

with source code at It lets you convert fonts between loads of different Palm formats, right on the Palm. For instance, you can use lo-res pre-OS5 fonts on your Treo 600 or even on the 650 (as small fonts) with Fonts4OS5/FontSubst/FontHackV. You can convert iSiloX fonts to many formats, etc., etc.