It probably doesn't quite deserve its own thread, but as of this morning, Dungeon #186 is also for sale as a PDF. This is notable only because issues #186 through #206 were never released as compiled PDFs via D&D Insider, but only as individual articles. As far as I can tell, the compiled PDF is just all the individual article PDFs slapped together plus a cover image; the page numbers are still those for the original articles, so there are multiple page 1s, 2s and 3s. However, that issue is at least available as single PDF for the first time now.