I'm surprised the compiler missed all the Living Greyhawk web-articles published on the Wizards of the Coast website, many of which had high-quality original content not found anywhere else.
Some of them include:
Glorvardum
The Cauldron of Night
Dominions of the Flannae
The StoneRing of Greyhawk
The Isle of Lost Souls
The Lands of Robilar
The Greyhawk Grumbler #3
Directing Oligarchs of Greyhawk
Greyhawk Grumbler #2
Druids of the Old Faith
The Greyhawk Grumbler #1
Safeton
Pelgaryn
Doomgrinder
Narwell
Backlash
A Sudden Turn of Events
Ford Keep
The Griffon's Nest
Blackwall Keep
Echo Crypt
Restless Nights
Burning Embers
The Choking City
Knights of Veluna
Knights of the High Forest
Knights of Furyondy
Lost City of the Suloise
Tenser and the Fortress of Unknown Depths
Silent Ones
The Duchy of Berghof
Winter Tales
Rumors and Whispers
Scant
Highport
Summer Tales
Rumors of Whispers (another one)
Knights of the Watch (part 2
Knights of the Watch (part 1)
Mines of Father Eye
Castle Karistyne
Jungle of Lost Ships
Whispers on the Wind
The Fields of Padyr
Haven of the Sun
Glorioles
Brightlands
Realm of Dust
To Serve the Greater Good
Azharadian's Tomb and the Ship of Fools
Fading Lands
The Kingdom of Keoland
I would also mention:
Expedition to the Demonweb Pits. Basically a Planescape adventure, but it's technically a sequel to Q1 as well, and it mentions Erelhei-Cinlu. So as much of a Greyhawk adventure as Q1 was.
The Shattered Circle. A more or less generic 2nd edition adventure, it mentioned the Suloise in the module background.
And, really, the whole 3.0 adventure path (
The Sunless Citadel,
The Speaker in Dreams,
The Forge of Fury,
The Standing Stone,
Deep Horizon,
Heart of Nightfang Spire,
Lord of the Iron Fortress,
Bastion of Broken Souls) was, while it didn't mention specific Greyhawk locations, Greyhawk in the broad sense because they referenced Greyhawk deities and cosmology. There were plenty of 1e Greyhawk modules that had less Greyhawk-specific content than they did.
Speaking of which, there are a number of 1st edition adventures that were retconned into Greyhawk during the 3rd edition period, like
Lost Island of Castanamir (referenced in several LGJ articles),
Tomb of the Lizard King (referenced in Gary Holian's Keoland article for LGJ #1), and
All That Glitters (referenced in the
Living Greyhawk Gazetteer in the entry for the Sea of Dust).
And a number of other generic 3.x modules were adapted into Greyhawk as part of the Living Greyhawk campaign, including
Red Hand of Doom,
Fields of Ruin,
Hellspike Prison, and
City of Peril.
A number of Planescape products detail the realms of Greyhawk deities and reference Greyhawk characters.
On Hallowed Ground would be the big one.
In other news, I'm amused there was a Mika the Wolf Nomad card for the Spellfire game. I kind of perversely want one.
Oh, and Horung the Anarch is a Forgotten Realms character (who was also mentioned in Planescape's
Factol's Manifesto), not a Greyhawk one.
Other than that, great list!