"Is it possible to set-up SMF so that there are no real categories/boards/sub-forums = you hit the main/index page and all you see it posts?"

Tiny Portal should enable said layout... it is a portal like plug, which will give you additional cms like capabilities...

"Also, setting up guests so that they may post is easy enough --- does anyone know if it's possible to, in the core or with a plug-in to send guest posts in to a moderator que?"

hmm, not sure, will try to get back to you on this one....

Risto[/quote]