Free downloads of the (some day will be) complete organ works of Johann Sebastian Bach, by a competent organist on nice instruments.
I post this annually and catch a few new members or people who didn't see it last year, plus the catalog is always growing. Also much of the thread last year was about how tracks were only available individually, but you'll see they are offering larger downloads consisting of groups of tracks.
Fill up that ipod with the good stuff! LINKY
Mods: last year you shuffled this thread around for a while before landing it in HD because it offers a "Large number of free mp3s." Here is the link to last year's thread.