I should say I have not been exploring enough, the resources you have put up in this community. I just found your "Query Post Plugin" two days ago, indeed it is exceptional. This alone will significantly reduce the amount of 3rd party Plugins non developer like us have to install in order to get different things done. More grace to your Elbows.
I know you once said you are not that very much into WPMU, no blames for that, might be because of the demand out there. But with the growing need of people wanting to be able to run multiple wordpress blogs and have easy control from one backend, I suggest you should consider making WPMU an option.
Now this is my idea: The "Query Post Plugin" to my opinion will become a Master Piece if it could become WPMU compatible, in the sense that when activated in the Main MU Blog, it should be able to pull posts from across the entire WPMU installation (Site) and display them on the Main MU Blog, just as it presently does on individual blogs.
This will also dramatically increase the potential of the Wordpress MU Blogging Platform itself.
Hope you take my suggestion into consideration.
Thanks for the Great work.