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MSDN has published a long technical article of mine on SharePoint Architecture. I should actually say “architectures” because, as I point out in the article, SharePoint has a lot more than one architecture. I cannot claim that it will tell you everything that you need to know about SharePoint’s plumbing, but it will tell you a lot.
It has 15,000 words and 11 diagrams on the following subjects:
Here’s the link:
SharePoint 2010 Architectures Overview
A printable pdf / word version would be useful.