Did you ever try “Unfocus Group”, “Conceptual Landscape” or “Personal Inventory” as method to understand the users of your products? The famous IDEO Method Cards collection offers a quick and compact description of 51 ways to meet your users’ interests. They are available as iPhone App here (Hooray!).
Those of you who prefer to have it on paper, can order the analog version at William Stout Architectural Books online shop and it comes as box with a stack of single cards.