I've put together 14 high-quality original podsafe instrumental tunes from my Penmachine Podcast into a CD album you can buy. It also includes a bonus data DVD with a bunch of cool stuff that isn't on this website. Find out more...
Speaking of Tim Bray, he provides an interesting and fresh analysis of that tune everyone knows, "Take Five" by Dave Brubeck et. al.
And I'm also very fond of the very different "Blankest Year" by Nada Surf, which I discovered via Tower of Song. (Beware, if you download it, the first line is rather rude, but in the best way.)