How about a master blog?
I (and many others) have multiple blogs and perhaps a publicly viewable master blog would be very useful.
From this master the other blogs can be displayed and linked.
My suggestion is a radical new theme which would act as a master blog in which other blogs could be embedded.
I think such a master blog deserves a special name.
isn’t it better to include the collection of blog into each blog’s blogroll, or simply make a page in each blog showcasing each of the blog. If i were you i would simply make a blog roll or atmost make a “master page” .