One note--

I didn't see any clause in there on a quick readthrough that lets you sublicense or declare your content to be available for others to use under that same license. There are only 4 types:
1) CC stuff (explicitly deliniated)
2) Their Licensed Stuff (anything else from the SRD)
3) Your Licensed Stuff (anything you make under the license)
4) Unlicensed Stuff (everything else of theirs).

But in order to be category 3, it must include Their Licensed Stuff and Your Licensed Stuff. Not "Someone else who accepted this license's Licensed Stuff, even if they said it was under the license."

This doesn't mean that you can't let someone else use your stuff...but you can only let them use the stuff that doesn't count as Your Licensed Stuff. Because they can't inherit the OGL status from you, they have to get it separately.

Maybe I'm not reading it correctly? But that's a real bummer, since then you can't freely use other people's OGL stuff, whereas before they could declare some of it Open Gaming Content which was added to the OGL pool alongside the SRD material, etc. Now you have (if I'm reading that correctly) to do a separate license dance for that stuff.