This is great stuff. I kind of agree with waywardoctagon above, I like the idea of "general" or "standard" for the suitable-for-any-audiences material and switching it with "worksafe" to convey that this material is a bit more complex but, well, still worksafe.
This is much less unwieldy than my own personal "ratings" scale, in which I basically just say "this is what's in here, read if you think you can handle it." Heh.
I always enjoy your meta. Hope to see you at Escapade again next year.