Update: The new WPMU DEV Multi Domain plugin is now available which addresses these issues - go grab it now!
I want to run one wpmu on domain1.com, domain2.com and domain3.com.
I want all domains to point to the same starting page (not a problem).
Here is the thing:
When users sign up, I want them to be able to select blogname.domain1.com, blogname.domain2.com OR blogname.domain3.com.
Wh't I DON'T want is "blogname" to be taken on all 3 servers by the same user.
Will Multi-Site Manager do this for me? When reading about it, it seems that it will only let me point blogname.domain1.com to domain2.com which is not what i want to do. Please correct me if I'm wrong though.