Joe Gregorio's writings (archives), projects and status updates.
What patterns exist for putting together RESTful services?
Editing the Web - Detecting the Lost Update Problem Using Unreserved Checkout. A W3C Note from May of 1999!
Announced in a post from Mark Nottingham. Personally I think he missed a great opportunity to name it Post Only Once.
Any I'm missing? Let me know in the comments.