WPMU at dreamhost
 

I've got WPMU running on DH (with subdomains) for a while now. Do the following:

- Install WPMU; no weird stuff, just follow the instructions (obviously select subdomains and not subdirs)

- From the Dreamhost admin panel, go to your DNS settings

- Look for the box titled "Add a DNS record to your-domain.com"

- Add a CNAME, enter a wildcard (*) in the "Name" field and your root domain in "Value" (ie. your-domain.com)

- Send a support request and ask them to modify the Apache's VirtualHost entry for your domain in order to support the wildcard DNS

- Wait until the new DNS record propagates (up to a couple of days)

- That's it

Hope it helps.