Rock with MegaSeg Radio.com.
This radio stationis made with MegaSeg. I downloaded it and had fun playing with this DJ software. At first I thought that iTunes would be all I needed to DJ a party.
That's true if you want to set it up and let it run for 5 hours. But if you want to segue (cross-fade) or beatmix between songs without any extra mixing equipment, this might be worth looking into.