Greyhawk is even more dead than Dragonlance these days. Actually, Greyhawk has been dead as a gaming world since the end of the 90’s if I remember correctly.
Fortunately, there is a tiny, but very dedicated fan base, which means you can still find Greyhawk resources on the Internet today. The web sites are horribly designed, and old as hell, but they contain excellent information on the World of Greyhawk.
If you like Gygax’s novels (RIP) check out this site, for a comprehensive run down of events in his Gord the Rogue series. Impressive work.
Now that we are about to put Dragonlance to rest after 30 years, I really hope the community is up to the task of keeping the setting alive. The Hawkers did it, and so can we.