I've been posting a series of "Design Diaries," short essays about the creation and development of Munchkin Warhammer 40,000 (including peeks at some of the art and cards from the game). There are four so far, with more planned – go take a look!
Design Diary: Munchkinizing Warhammer 40,000
Design Diary: Never Enough Dakka - Warhammer 40,000 Weapons in Munchkin
Design Diary: Controlled Chaos - Turning Warhammer 40,000 creatures in to Munchkin Monsters
Design Diary: Faith, Firepower, and Fun - Playtesting a Warhammer 40,000 Expansion
Design Diary: Two Fandoms Walk Into a Bar – Adapting the Warhammer 40,000 "Meta" Into Munchkin
Design Diary: New Frontiers – A Peek Inside Munchkin Warhammer 40,000: Faith and Firepower