I picked up the new One Page Dungeon Compendium, and as always it is a visual and creative feast. Filled with interesting and creative maps, and chock full of great ideas for adventures and dungeon locales.
I couple of my favorites are The Quintessential Dungeon and The Sky-Blind Spire.
The Quintessential Dungeon is literally a dungeon filled with all the most overdone tropes and cliches' but all in good fun with a terrific fresh spin on it all. A magic mirror, a bottomless pit, a dragon lair that has no way it could get in or out, yet it all kinda works. It reminds me of the spirit of Tomb of Horrors and White Plume Mountain.
The Sky-Blind Spire is a classic wizard's tower. The thing I like the most is how well done the map is, very legible, cool to look at, and several good ideas for rooms and adventuring spaces. A lot is packed into one page. Interestingly the room descriptions are listed in reverse numerical order. The hook, or one-super-cool-idea that makes this adventure stand out is that the entire dungeon is one big spell, but I'll let you find out for yourself what that means.
In some ways this is one of the most diverse selections of one-page dungeons yet. It has a lost dwarven city, a non-Euklidean dungeon, a planet, and many others. Best of all, its pay what you want so it won't break your budget. Check it out: