Big fan of no-ip.com. DNS2GO.com used to be great, too...and they still are, but they now charge for the service.
The nice part about all of this is that you get to choose the name of the host. No-ip.com has lots of pre-done domains available. no-ip.com is the most popular, so you could make a host be ryon.no-ip.com, then just connect to that address - configure it as ryon.no-ip.com in the radmin viewer. Works great!
