Designing Interfaces and REST

I've blogged in the past about how the design of interfaces in distributed systems is an important, but often overlooked topic. Instead the current debate seems to be around the technology used - SOAP, REST - rather that the interface design itself.

I was therefore interested to come across this blog entry from Joe Gregorio in which he applies REST technology to the design of the Apache DayTrader benchmark. What I find striking about this entry is how much care he has given to the interface design, reducing the original, and somewhat ad-hoc interface specification, to simpler principles based on a few entities and operations.