Joel Oleson wrote a very extensive and good article about the upgrade from SharePoint 2007 to 2010. Not only the article is interesting because the upgrade is discussed but also for the lists of all the features in SharePoint for example.
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This guidance helps architects and developers design, build, test, deploy and upgrade SharePoint intranet applications. A reference implementation that is named the Contoso Training Management application demonstrates solutions to common architectural, development, and application lifecycle management challenges.
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More guides on other subjects can be found here. Very interesting.
