One of the best sites I have found for downloading shareware/freeware/demos is http://www.download.com This carries a wide range of software, neatly categorised, for both PCs & Macs. For Mac users with Palm Pilots the place to go is
http://www.download.com/Mac/FrontDoor/0,1,0-335,00.html?st.dl.allcat.cats.cat335

PC users - I'd suggest starting at http://www.download.com My cookies catapult me into the Mac domain.

Subcategories in the PalmPilot area include applications, business, games, home & personal, interface enhancements, internet and utilities.

This is one of my favorite sites. They often have more than one downloading gateway for a given piece of software, so if one doesn't work you can try another.

And yes, I wish I could write this using HTML so that you could go straight there...