I have a project which will effectively create multiple blogs that will be fed existing content (don't worry, this isn't copyrighted content from other blogs or anything like that). From a DB management and moderator point of view, and to limit hosting costs, I would like to avoid the built in multisite functionality which requires a separate DB for each blog.
I am wondering whether, with some intelligent duct-tape hacking, it is feasible to run multiple blogs in one WordPress blog that appears as many separate blogs. I think that Categories might be hijacked to make this work. Basically each separate "blog" is a separate category.
Is there anyone who has done this or has another, single DB multi blog approach (using WordPress)? Words of wisdom or caution about the kind of tweak I am suggesting?