One more question about wpmu and domains and then I promise I will stop (for today

). What do you have on the index page of your main domain if you have a whole bunch of random subdomains, none of which would tie together well? I guess you could do it like mike's
Welcome to X7G.net (hey dude where's the love? you locked us out!!). And then my question would be can you disable the "create a new blog?" so that other random people aren't creating blogs?
Is there a better alternative for the main domain when using wpmu?