If you are a member of Geekswithblogs.net and have a domain you are currently redirecting to your blog, or just want to participate in this beta, please contact me via this blog and I will get you setup in the system. I want to ensure I do not have any bugs as this took a decent sized overhaul to the page handling model of SubText to make this happen.
Review this post if you are not sure what I mean by custom domains and join in on the fun.