by Andy Diament - 

I've had some successful sessions where I've encouraged students to create as many entries as they can in 20 minutes, as an overview after a topic. We reviewed them afterwards.

I've had glossaries that students have built up themselves over a term or more. Once printed off using the pretty print option, 2 pages per A4 sheet, they look like quite significant revision aids. You could do this with an existing glossary.
Andy D