Pages and comments plugin

[yojoe]

Do you mean something like: if you save a page with a keyword/tag like _group:MyGroup, then it gets automatically added to P&C's group MyGroup ?

Exactly!
Since meta info is cached in pages.xml I think it could be done pretty easily.
Along with SA Tags plugin everything should be easily administrable.

As it goes to plugin itself, blog type option needs more formatting, as its hard to stylize with currently used tags structure.