With John Elliot's encouragement and approval, I've attached an Anki flashcard file I put together using the information from the book's appendices and the 55 mp3s. The name is on the front, the numeric chords show and audio plays on showing the back (answer).
While I've tried to check everything, I might have overlooked an error somewhere. If you find one, please let me know so I can update the group file.
The flashcards require Anki software, which runs on multiple platforms. The desktop version is free, I haven't explored the others. Here is the Anki download page.
I didn't have time to come up with a good flash card model for joins, but would be happy to add those cards if someone sends me that information in "Front/Back" format.
I hope you all find this useful, let me know what you think!
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A.H. (Howard) Gilbert also sent me a second set of Anki flashcards. Here is his description as posted in Google Groups:
"All of them have a blank front face but should play the audio snippet for the brick from John's CD or in a few cases Conrad's. When you press the show answer tab the reverse side, in most cases should give, the brick in Roman numbers and have 1 or 2 snippets of the use of that brick in a tune but a few (mostly the common ones eg regular, 2 goes) don't have a tune snippet."