I like cards - the way they feel as objects, the way they invite play. And I love brainstorming and idea generation. The IDEO Method Cards combine both. Although IDEO has made an application for the iPhone which costs one tenth as much as a paper deck (and they offer a free app with sample set of 8 cards) - I'm thinking about ways I could justify buying the printed set of 51.
(via Cool Tools)
I love that sort of thing. Are you familiar with Brian Eno's Oblique Strategies cards??
http://en.wikipedia.org/wiki/Oblique_Strategies