I must say, InfoQ is doing a really good job of covering enterprise development with plenty of interesting articles on SOA. There is a really good interview from Jim Webber from Thoughtworks (The same company Martin Fowler works for these days). He talks quite a bit about MEST (Message Exchange State Transfer) and an useful "standard" to support MEST called SSDL. The main jest of SSDL is that it is a replacement for WSDL (Web Services Description Languages) based on SOAP that gets you out of the Request/Response hell that WSDL creates. SSDL allows you define much more complex web service interactions such as sending two requests to a web service and get 5 responses back. It's also interesting to note that there is a SSDL open source implementation done by Patric Fornasier of National ICT Australia as a research project called SOYA. It's built on top of Windows Communication Foundation and looks very interesting. Suffice to say I'm going to be be playing a bit with this shortly.
The interview with Jim can be found here: http://www.infoq.com/interviews/jim-webber-qcon-london
More on SSDL can be found here: http://www.ssdl.org/
Lastly, you can find SOYA here: http://soya.sourceforge.net/