Thanks to Sean I just learned about Roy Fielding's blog.
I don't know why it never occurred to me that Roy Fielding would have a blog, and it would likely to be a good source of commentary on the evolving philosophy of the Web, but it didn't. He does, and sure enough it's chock full o' goodness.
Highlights include this post about how to efficiently build a RESTful Internet-scale event notification system for querying Flickr photo update events - using images as bitmap indexes of event timeslices! Or the post which Sean noted, along with this one - both cri-de-coeurs about the pain of seing the clean concept of REST muddied to the point of meaningless.
Anyone confused about REST would do well to avoid inhaling too much smoke and get a dose of fresh air from the source...