Dungeon 151 was the first issue published solely via the web after Wizards of the Coast assumed control of the magazine from Paizo in October 2007. It contained five articles released online in that month:
-Iggwilv's Legacy: The Lost Caverns of Tsojcanth, an adventure released as a separate pdf document
-Hell's Heart, an adventure released as a separate pdf document
-Dungeoncraft: It's Never Too Early, an article published only as a web page
-Save My Game: I'm Stephen. I Solve Problems, game advice published only as a web page
-Maps of Mystery: Delver's Dale, a map published only as a web page
The articles were never collected into a single document. Some are still available online.