I'm an administrator of 10-20 separate WordPress blogs, and it's a big pain for me to login to all of them separately. Is there some sort of interface that allows me to do a single-sign-on administration of all of them, like there is under a WordPress MU umbrella?
If so, what's it called? I don't even know the term I'd use to search for this.
I've yet to try it, but Virtual Multiblog might solve your problem.
Or, try the search term:
wordpress + multi blog
Google tends to vary results depending on your country of origin, so I'm not sure that what I found is what you'd find.
If it's just managing posts & pages and a few other items, a blogging client might be the way to go. WordPress provides a good starter list of programs - http://codex.wordpress.org/Weblog_Client