I'm giving "Barbarians of Lemuria" a try. Mind you, it's for Conan style games so lots of stuff like Carrion Crawlers, Gelatinous Cubes, Orcs and Goblins are missing...
I'm planning on making that up as I go along.
WH:A&A has some good rules for setting out a dungeon w/o a GM but I find that the way it is laid out continues to be it's main failing point. The 2HW games are very good for solo or same-side gaming but they all suffer from the way the info is presented - unless you are familiar or willing to read them thoroughly. IMO.
SoB&H has some good ideas - I used it for a while but found that there were some things that were too loosey-goosy for my tastes.
I should add that lots of people use Mythic for this sort of thing as well.