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There's the huge Expedition to Greyhawk Ruins and Expedition to Demonweb Pits, and Return to the Temple of Elemental Evil.
Dungeon Magazine did a full update for Maure Castle (From Mordenkain's Fantastic Adventure)that took a whole issue, and was done by Robert Kuntz, the original author.
X1, Isle of Dread was also updated and placed in Greyhawk in a Dungeon issue, and all 3 of Dungeon's APs were set in Greyhawk as well.
If you've got a copy of the last issue of Dungeon, there's a list of quite a few adventures set in Greyhawk, especially when 3.0 came out and Greyhawk was made the offical campaign for awhile.
There were also many adventures/maps and data put out for the Living Greyhawk campaign while it was running, simular to the short PF society adventures. Some of these are new and some tie into previous products.