Alas! The loss of possibility of all this Greyhawk material makes me sad. Frankly, I couldn't stand one iota of the Greyhawk stuff released after you left TSR, Gary... they just couldn't do it right. I was pleased that WotC ressurected the setting for 3E, but I don't feel they've supported it in a decent way either.
If there was some way for you to publish the stuff you've mentioned above in a generic game setting, grognard's would rejoice!
Another thing I would have jumped at greedily: a deities book for the Greyhawk pantheon.
Oh, well.