Is there an index of common playbook directives?

I’m looking for something like the module index pages, but with coverage of the shared directives that can be included in any play, e.g. name, sudo/become, when, register (bonus points for something that details all the properties of the object that register returns), etc. I see these scattered about in their respective sections of the docs, but sometimes the descriptions there don’t seem exhaustive, and who knows what directives I’ve missed? Is there another reference I should be looking at that has it all in one place?

Thanks!
–Brad

This summary(http://www-uxsup.csx.cam.ac.uk/~jw35/docs/ansible/ansible-summary.html) is very useful despite being a little bit outdated.

on my ‘wishlist’ is getting all this ‘autodocumented’, much like modules do right now.