Scan Guide is a program for all you people out there with radio scanners and ham radios. It has tons of frequencies with 24 categories and even more subcategories. It is extremely easy to use and takes the place of all your frequency scanner books that are a pain to drag around. The demo version of Scan Guide is fully functional but has a popup screen and a 30 day limit. You don't have the popup and the 30 day limit If you register. Registered users also get free minor updates.