Gamemastering by Brian Jamison, which takes a GM from character generation through running a session.
One difference which I may place a little more importance on than most, is that Robin Laws at least seems accepting of the dungeon crawl, whereas Brian Jamison seems to have an obvious disdain for the style.
Never the less, the latter's book has already proven immensely helpful, and, since the PDF is free, of the two, it is probably the title I'd recommend if anyone asked.
I also finished reading Poltava 1709: Russia Comes of Age which has me fired up for my Great Northern War project. On Tuesday night I had a little time to paint and work proceeded on the battalion of Kievski Regiment infantry.
Tonight, I had planned to run the first session of the post-apocalyptic fantasy game for Lady Shadowmoss, but those plans have fallen through (hence the time for blogging!) which means more time at the painting table this evening.
Finally, tomorrow night I'll be playing Session 13 of The Ever Expanding Dungeon in which our heroes return to the underground to finish mapping the 1st level.