A few years ago Osprey Publishing started publishing miniatures wargames in book form. This probably shouldn't have been a huge surprise, since Osprey's military history line has long been a huge resource for miniatures painters and historical wargame designers. So far my two favorites in the Osprey wargame line are Lion Rampant--Medieval Wargame Rules, by Daniel Mersey, and Andrea Sfiligoi's A Fistful of Kung Fu--Hong Kong Movie Wargame Rules.
The wargame line has notably moved away from the straight historical treatments that Osprey made its name with. Andrea's book, for example, is a skirmish wargame treatment of the territory Feng Shui arranges for roleplaying games. And with the launch of the Osprey Adventures line in 2010, Osprey has a full-fledged documentary fantasy project going, with books on everything from Hercules to Zombies to Werewolves and Ken Hite's The Nazi Occult.
The catalog of about-to-be-published Osprey books is a bit like walking into the history section at the bookstore and finding yourself at a gaming convention. Chris Pramas is about to publish Orc Warfare! Phil Masters is coming out with The Wars of Atlantis. Ken is putting together The Cthulhu Wars.
In a week, two friends have Osprey books coming out that I've already pre-ordered. Ryan Miller has a naval wargame, Fighting Sail: Fleet Actions 1775-1815. And Steve Long is publishing Odin: The Viking Allfather. The artist for Odin, a Spanish woman named a-RuMor, does great stuff, and I'm keen to see Steve's treatment of Odin-through-history and Odin-in-myth.