Somehow, I missed this, which makes me wonder what else I've been missing, but James Kibbie, organist and University of Michigan professor, recorded all of J. S. Bach's organ works on a variety of German baroque organs, and then posted all the recordings online, for free. Extra nerd nourishment: for each piece, he's also listed the organ registration. That's about a week's worth of procrastination fodder, right there. Fantastic.
I immediately went to my two favorites: the "St. Anne" prelude and fugue, and BWV 679, a sly little show-off fughetta on "Dies sind die heiligen zehen Gebot" ("These are the holy ten commandments"), in which Bach states the fugue subject, yes, ten times, and at the point where the commandments shift from "thou shalt" to "thou shalt not," inverts the subject. I always imagine Johann pouring himself an extra, self-congratulatory glass of beer after dashing off that one.