Bloglines has announced new web services that they offer. Unfortunately, they tried to attach themselves to the term REST without really understanding it. I am encouraged that the term, and the idea of alternatives to SOAP, are gaining traction, but not at the expense of corrupting the meaning.

So what is the problem? The getitems operation works via GET even though it will "mark unread items as read". This is clearly not an idempotent operation. It would have been better to opt for POST and not GET. It's a common problem.

Other commentary by Sam Ruby and Tim Bray.