The Player's Handbook mentions Dragonlance as one of the first campaign settings in the sidebar on The History of D&D (p7).
Draconomicon: Chromatic Dragons mentions the Dragonlance setting in a few places. The armies of Takhisis are given as an example of Mixed Societies (p23). In the Famous Dragons section (p88) four dragons from the setting get a paragraph each (Albino, Ember, Khisanth and Malystryx). Finally Cyan Bloodbane gets a two-page spread (p234-235) including his origins as a villain in Dragons of Winter Night.
The Manual of the Planes notes that the sages of Ansalon know their world as Krynn (p7) and lists Krynn as an example of a natural world in the section on The World Axis Cosmology (p12).
In Dragon #372 James Wyatt's Design & Development article (p69) reveals that the introduction of Dragonlance's tinker gnomes made him lose interest in gnomes as a race.
In Dungeon #163 the Save My Game article (p102) references the Dragonlance saying "evil turns on itself" but says nothing at all about the setting.
Dragon #376 mentions a Dragonlance 25th Anniversary event taking place at Gencon 2009 (p86) but again says nothing about the setting.
The 25th anniversary is mentioned again in Dragon #377. The Ampersand article (p87) mentions several upcoming releases with Dragonlance connections: Dragons of the Hourglass Mage (the last book in Weis and Hickman's Lost Chronicles Trilogy), the debut of 4e draconians in the Monster Manual: Legendary Evils miniatures set and in Draconomicon: Metallic Dragons.
Draconomicon: Metallic Dragons doesn't actually mention the Dragonlance setting in the section updating the draconians to 4e but there is a two-page spread on Silvara (p215) that includes an excerpt from Dragons of Winter Night as part of a sidebar on her origins.
In Dragon #381, the D&D Alumni article (p110) covers Metallic Dragons, and the emphasis placed on the split between chromatic and metallic dragons in the Dragonlance setting gets a mention.
In Dragon #382 there is a perfunctory mention of Dragonlance in the Ampersand article Looking Back (p115) but this retrospective simply notes that there were new Dragonlance novels published in 2009.
Dungeon #178 has an article on Fantastic Terrain: Elemental Motes (p70) which mentions Krynn's flying citadels as examples of sky islands that have been torn from the ground and are held aloft by powerful rituals.
In Origin Stories (p8) in Dragon #389, Raistlin taking the test of High Sorcery early is given as an example of the price of ambition.
The Rules Compendium repeats The History of the Game (p8) from the Player's Handbook, including the mention of Dragonlance as one of the first campaign settings.
Dragon #392 has an article on Everwatch (p11), a community intended as a base for an adventuring group. This draws a comparison to Solace being the home to the Heroes of the Lance in the Dragonlance Chronicles.
The Editorial in Dungeon #184 (p3) mentions the Dragonlance Chronicles as an example of "saving the world" stories.
Dragon #400 reprinted a number of articles from earlier issues. In Mike Mearls's introduction to the reprinted Jester article he notes that the original Dragonlance trilogy taught him that gnomes were supposed to be played as complete goofballs.
The Editorial in Dragon #404 notes that Dragonlance was one of the three most popular classic settings in a recent WotC poll. (The other two were Ravenloft and Planescape, in case you were wondering.)
The Book of Vile Darkness mentions three Dragonlance characters in its section on villains (p43). Takhisis is given as an example of a detached villain, Lord Soth as an example of a tangential villain and Kitiara as an example of a personal villain.
D&D Love Stories in Dragon #407 references both Riverwind's quest to prove himself worthy of the daughter of his tribe's chieftain and Raistlin's romance with Crysania as examples of forbidden love. Lord Soth's transition to a death knight as a result of his wife's curse is also called out as an example of undying love.
In the editorial of Dragon #408, Chris Perkins expresses the controversial view that while the War of the Lance is his pick as the most iconic D&D story, the Dragonlance setting is hamstrung by the fact that there is only one story worth telling, and that every other adventure seems to pale in comparison.
Dungeon #200 lists all of the Dragonlance adventures that have appeared in Dungeon in its index of issues #1-200 and highlights Tracy Hickman's Anvil of Time adventure from issue #86. In A History of Dungeon later in that issue, Chris Perkins mentions that he wished he'd turned down an assignment to write a Dragonlance: Fifth Age adventure, because although he likes the setting he is a "dice man". Amusingly, where he later became the editor of Dungeon with issue #65, one of the first things he had to edit was his own Dragonlance: Fifth Age adventure that he hadn't wanted to write in the first place.
In Dungeon #410's Editorial, Chris Perkins notes that they would love to provide more support for Dragonlance, but that WotC gets so few proposals for adventures in that setting. A second Editorial in the same issue, by Greg Bilsland, supports this by listing Dragonlance as a theme for which they would welcome article proposals. As we'll see below, some contributing writers paid attention to this call.
In Dragon #412 an article on Chauntea and Silvanus mentions the Dragonlance goddess Chislev as an example of a nature deity in an Other Worlds sidebar.
Dragon #416 has some actual 4e Dragonlance content! There is a seven-page article on The Life of Soth including a comprehensive 4e stat block.
Dragon #421 has more Dragonlance content, with a five-page article covering Legendary Items of Krynn. This includes Brightblade, Rabbitslayer, the Kender Spoon of Turning, Wyrmslayer, the Staff of Magius, the Staff of Mishakal, and of course, the Dragonlance. That issue also has a four-page article on Draconians, but it makes no specific mention of the Dragonlance setting.
There is yet more 4e Dragonlance content in Dragon #422, with a five-page article on Tinker Gnomes, including a sidebar mentioning their Dragonlance origins and the character Gnimsh from Dragonlance Legends.
The final mention of Dragonlance in 4e seems to be in an article on Time Travel in Dragon #430. The article mentions the time travel shenanigans in the Dragonlance Legends trilogy and notes Huma defeating Takhisis as a "fixed point" in history. The article also covers characters from past eras being transported into the campaign's current time, using the example of a Dragonlance character who had been a contemporary of Huma and possibly a participant in the Third Dragon War.