Can you get up to the pick-a-server screen or whatever its called and not see anything? Thats the registry being down: happens to everyone frequently. Simply go to Advanced and type the IP of the address of the server you want on.
Or is this something else, ie an error message when tyou try to open the program?
Well, SKYUPPERCUT60 has given you the best IPs. I also find the server registry is sometimes down. The good thing is though, that when Competitor comes out, the server registry will always work apparently. Yay!