Oblique Strategies (subtitled over one hundred worthwhile dilemmas) is a set of published cards created by Brian Eno and Peter Schmidt first published in 1975, and now in its fifth edition. Each card contains a phrase or cryptic remark which can be used to break a deadlock or dilemma situation. [wikipedia]

Oblique Strategies, now available for free on the iPhone.

MAKE: Blog: Creative advice on iPhone