Use your phone or ipod to study!
A mobile device that's already flash card sized can be a great solution for drilling.
gFlash:
Apps like gFlash do a great job of turning a Google docs spreadsheet into a study aid on the go.
Quizlet:
There's also a number of sites that crowdsource knowledge sets, like the popular Quizlet, which has both mobile and web-based applications and user-generated flash cards for a wide range of topics.
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