I recently bought a bag of Red Espresso, which is rooibos tea ground for espresso makers. Rooibos has no caffeine, and has a strong toasty flavor. It's fun to make espresso-style and it even produces a crema-like substance. It's a wonderful before-bed treat. (This is an unsolicited endorsement. Boing Boing doesn't accept money for posts.)
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.