Rockford Lhotka has released his second edition of Business Objects, this time for .NET 2.0 with his new CSL.NET 2.0 code.  Its is a business framework designed to help programmers implement distributed applications using business objects.  I read the first book and learned a ton from it so I highly recommend you pick the book up, its an intense and in depth read on architecture design and framework design!  If you arent familiar with the conepts he thoroughly explains everything in the beginning and then starts to break the framework apart as you go along.  Near the end of the book you setup test projects to see how it all comes together in a real world scenario!

Expert C# 2005 Business Objects, Second Edition

CSLA.NET 2.0

Have fun!