WordPress MU

i want to make users to use from multiple domains during registeration ...
i search alot
but can not find the way

i found this but i think it is for old version can any one update it
http://johnbreslin.com/wiki/index.php/WordPress_MU_Multiple_Domains_Modification

i want members when register at mydomain.com they can choose for the domain mydomain.ocm . mydomain1.com ,mydomain2.com .. so the blog link will be
mydomain.com/blog/blogname
or (not and )
mydomain1.com/blog/blogname
or (not and )
mydomain2.com/blog/blogname
... it is like giving a hosting blog service for your friends domains and give the ability to ur friends members to have a blog on ur wpmu installation but with thier domain
.. sorry for my bad english ..

i chk this
http://mu.wordpress.org/forums/topic.php?id=2076&replies=13
but i think it is not what i want