I never, ever saw any Living Greyhawk stuff. You know why? Because it wasn't available to the general public.
As for the mags, I will agree that they had some awesome GH content. But squirreling it away in the magazines meant that there were no real sourcebooks produced, though I keep hearing good stuff about the LGHG. So there was... one. Which, you know, I only ever saw on a shelf once, at one FLGS; I don't think it was pushed very hard or advertised very well.
I mean, there was probably great homebrew material written by plenty of home DMs for Greyhawk, too, but I just don't think WotC has ever really given GH more than half-hearted support. The 3e era was perfect for it- GH was the 'default setting', for God's sake!- but if you wanted to have as much as a map of the setting, you had to track down, was it two or four? issues of Dragon, several of which never even reached my FLGS (I'm not sure if this was a demand issue or a FLGS issue or what).
I can't count stuff that wasn't official Greyhawk material with the label on it that you could buy on the shelf, so the Gazeteer is about it for 'full-assed' support, in my opinion.