I'm interested in this as well.
I just got into the "artistic nudes" niche, and it's already paying off. I'm getting crazy traffic for only being up for about two weeks (
http://www.primanudes.com). It's already up to 10k a day, with just links and SE, but we'll see how long that lasts..
I have:
blognudes.com/net
nudesblog.com/net
nudeartblog.com/net
and I grabbed dailydirtblog.com/net just for fun.
None are online - just grabbed them.
I'm thinking about using these to promote primanudes.com with site updates, member pic uploads, etc. Maybe forum but I don't think I'll have time for that.
"Nude Art" is big on overture (relatively - it's an underserved market, I think).
What blog software are you using? Will there need to be some level of compatibility between the different blog software within the "empire"? Other than the obvious, like RSS capabilities.
Thanks - I'll cc this to you in e-mail.