One thing I knew would happen sooner later was for blogs to fold their spinoffs under one URL.
When we launched the Blogger Mojo network, we initially had distinct URLs for each blog, so for example SoundMojo.com was the music blog, but soon afterwards we simply put the blog under WatchMojo.com and the SoundMojo.com blog redirected under WatchMojo.com/music/blog.
This week, we saw Gawker Media decide to direct Valleywag under Gawker.com… and now I see that Alley Insider has done the same thing with Business Sheet and Clusterstock, two blogs it launched but now seems to have streamlined, or as the saying goes: aligned.
I expect many more of these moves to come…it makes sense for the largest sites to separate blogs, especially if the topic (content and audience) are widely different… but otherwise, I think you are about to see a lot more of these moves.