Richard Turner (Product Manager in Microsoft's Web Services Strategy team), has published the first of a series of papers that provides guidance on how to best use Microsoft Web service and distributed systems technologies in order to build distributed, service-oriented systems using today's platform.
The first paper, “Developing Distributed Services Todayâ€, can be now found on MSDN, at this link, with more on the way very soon. [found via Paul Fallon]
This looks like a very good start and is recommended reading. This first article represents a high-level overview of the various distributed service options from Microsoft today, with a few key recommendations. Keep an eye on Richard's blog for the remaining articles in the series.