A couple of minutes ago, Bob Haugen posted a question on the rest-discuss list that essentially comes down to the question of how the use of REST affects a classic 2PC scenario. Note that the question is not how you do 2PC with REST but what the implications are regarding compensation strategies etc.
The scenarios is this: There are N farmers that each have an amount of Xn pints of berries to sell. The farmers tell M market places about their amount and K buyers order berries from the market places. The 2PC issues come in when orders to different market places overlap and more berries are ordered from a farmer than he has available.
I tink this relates very nicely to my RESTifying Procurement endeavor and I therefore plan to make the scenario the overall target to which my experiment should evolve.
You might be interested in http://www.infoq.com/news/2009/09/reservations.