A series of updates are available for Enterprise Library and Unity and a few other bits of general interest

There is an update for the Enterprise Library 5.0 which is only required if you are using the Silverlight Integration Pack and need WCF RIA Services Integration or configuration tool support. get it here

However the most interesting development is a version of the Enterprise Library for Silverlight developers get it here it contains Caching Application Block, Exception Handling Application Block, Logging Application Block, Policy Injection Application Block, Validation Application Block, and Unity Application Block allowing you to develop best practice effectively.

Just in case you don't have the Enterprise library you can get it here

Microsoft Unity 2.1 is a dependency injection container. this is a minor update on Unity get it here , I also recommend you visit the Patterns and Practices page for Unity here

There is also a port of Unity 2.1 for Silverlight here

if you need to learn how to use these great libraries there is of course a Hands On Labs (HOL) for Enterprise Library 5.0 here

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The P&P group have updated the Enterprise Library to 4.1 get it HERE

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A new version of the Application Architecture Guide ( v2.0 ) has been released to beta.

Part I, Fundamentals of Application Architecture
Part II, Design
Part III, Layers
Part IV, Quality Attributes
Part V, Archetypes - Design and Patterns

Get it Here.

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The P&P team have released the Acceptance Test Engineering Guidance Guidance book. The guide is designed to help groups meet customers expectations of delivery.

Get it here

I can’t say enough how much the P&P team are making a difference in quality to the whole of the development and IT industry, if you haven't had the privilege of looking at the exceptional set of knowledge the P&P team put together look here

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