Marstan's Citizenship Study Stack

About 30 pages into a Google search of "citizenship questions," I came upon a fun resource: Marstan's Citizenship Study Stack--java-script flash cards of the USCIS 96 History and Government Questions. Study Stack publishes each flash card stack's javascript, which can be easily added to a personal webpage. The flash cards can also be exported to an iPod, cell pone, or PDA. A crossword puzzle, wordsearch, and matching games are also included.