I have set up the subsites module and can get it working for sub1.domain.com, sub2.domain.com, etc. However, I don't know how to make it work for domain1.com, domain2.com
I am unable to post to topics in the forum archive so I refer you to the post below... If willr is out there, I'd appreciate any help!
In the following post: http://www.silverstripe.org/archive/show/105773?start=8
on: 26 June 2008 at 9:58pm
The subsites module is probably what you are looking for. You can use the 1 CMS to manage multiple sites. For a real world example we have recently done is the epmu.org.nz site. This site uses the subsites module to control the http://www.workrights.org.nz/. You can also create, manage as many subsites as you want and set custom themes.
As to the state of it for 'general' release, It has no documentation and has had no public releases as of yet (only used on a few internally done sites) so its probably in the 'risky' to use category!