By default, the top dark bar of the admin UI in MU is replaced with a list of the blogs you're currently running (or at least have some privileges in):
My plugin will fill this space with the same menus as in the regular WordPress version, plus a drop down list of all your blogs:
It's currently working smooth on my Mu test blog, running Mu's trunk which is marked as unstable or even, for some files, as "*DON'T SVN UPDATE!*" :). I'm waiting for something more polished to be released and will eventually publish my plugin update. My recent experiences have taught me not to release plugins developed against an unstable, since things are too likely to change and break your work.
Mu users and admin, stay tuned! (and feel free to ping me if I forget about this, I'm not a regular Mu user)
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