Ham Radio Nation is a Social Networking Site, sorta like Facebook and such, but specifically for Ham Radio. It has loads of things to do, along with meeting lots of other hams, like blogging, forums, an awards program, classified ads, propogation info, an always current contest calendar, chat rooms, product reviews, and more.
I stumbled into it by accident, but have been logging in and doing something on it every day or so. Check it out! You can find it at: http://www.HamRadioNation.com
