How do I map custom domains to my sites on a multisite Wordpress installation?

I just 开发者_StackOverflow中文版upgraded one of my many blogs to Wordpress 3.0 and I was glad to see that I now should be able to run all my blogs from a central installation.

I have the multisite stuff configured and up and running, and can create new blogs as I wish.

My host is set up to handle wildcard subdomains, but I'd like to map my already existing, proper domains to sites instead. How do I do this?

Redirecting the domains is not an option.

There's a domain mapping plugin:

http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/

If you download the dev version, that will work with 3.0, I'm told:

http://plugins.trac.wordpress.org/browser/wordpress-mu-domain-mapping/trunk/

There should be a download link at the bottom of that page.

Modrewrite is probably the answer, but without knowing more about the server and how wordpress is doing the multiple blog feature (I use it and have upgraded to 3 as well, but i haven't looked at it very closely), it's hard to give a specific answer.