Font Collector is now Free (GPL) at

http://www.palmgear.com/index.cfm?xyz=81547

with source code at palmfontconv.sf.net. 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.