IDEO's Method Cards
I received my IDEO Method Cards, and they're big, twice as big as your usual playing cards. The writing is good; short and sweet with funky photos on the reverse. The content isn't earth shattering - each features a user research technique - but the format is quite handy and sure to stir up some new ideas at work.
A coup for IDEO is how - as in this Fast Company article - they position what could be considered an advertisement as a confident revelation of their methodology. Clever.