If you have a PDA that runs PalmOS 5, you probably have a high-res display of 320×320 or better. If so, it is worth your while to download and install Fonts4OS5. Fonts4OS5 lets you substitute the normal system font with any other font you choose to install. But better, you can also specify the font size, and you can do it on an application-by-application basis. For example, web browsing becomes a completely different (and very usable) experience when you use Xiino or WebPro with an 18 point Sans Serif font rather than the default 22 point font. Do you have good eyesight? Check out how much text you can cram on-screen with a 16 point font!
Now I just wish a font anti-aliasing companion app called FontSmoother would work on the Zodiac. Come on guys, what's the hold up!?