if you want to make a server on minecraft mac this is a good blog

MAC:

make new folder.

download minecraft_server.jar at www.bukkit.org

put minecraft_server in the folder

open but don't change .jar it should give you permissions start.command and more

download hamachi unmanaged mac osx version

install hamachi and follow instructions.

open permissions and in server ip type the hamachi ip

done i will put a youtube clip to help

www.youtube.com/watch?v=IBdeUtTl_Fw