OpenID for Dummies - Webmonkey: "How Do I Use a Vanity Domain?
If you just want the domain you bought to be your OpenID for geek cred, Blogger abides.
Start up a blog on Blogger. Don't worry, you don't have to update it, or (gasp) write anything to it. We're just going to use it for the OpenID providing.
After creating an account (or using your Google/Gmail account) you'll be asked to name your blog. Follow the steps, name your blog whatever you want (it's temporary).
Once you come to a blank editing screen, click on Settings
Click on the Publishing sub-tab. You'll see a Custom Domains link. Click on it.
You'll be directed to a screen where you can buy a domain through Google, or click Advanced Settings if you already own a domain.
Enter your domain in the settings and submit. You might want to use a subdomain if you're hosting something already. For example: openid.yourdomain.com
Wait, you're not quite done yet. You'll have to set up a CNAME redirect to Google through your domain host. Find your domain host and follow the directions in Google's custom domain help page."
-- Finally a tutorial I can understand
