A trip down memory lane to see where we've been with "Rich" clients, then what makes up a "smart" client, and where we might be headed...

David Hill's WebLog : What is a Smart Client anyway?

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...and from the same author, a case study about Dell making the move towards smart clients, and loving it.

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Smart Client architecture and design guide at MSDN

and PDF version of the whole document for offline viewing

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Finally, the Smart Client Developer Center at MSDN