Thank you everyone for your responses. I will check out those links that have been posted.
I have a question though. I have a public OA server that I keep online some of the time. Can I put these other maps from the sites you pointed out in rotation on my public server? Will it be ok as far as licensing etc is concerned? I am still more or less a newbie in this so an answer to my query will be greatly appreciated
JukeBoxHero