From DotNetKicks, Krzysztof Cwalina’s team has published their LINQ Framework Design Guidelines.
Another great resource to go along with Cwalina and Abrams ‘Framework Design Guidelines.

System.Linq.Xml - The XML object model for Linq
XElement is the basic building block (or element) of an XML document in the System.Linq.Xml world. It is, after all, just an XML element. Using XElement, the most basic XML document can be formed with this:
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XElement doc = new XElement("DocumentRoot");

This will give you a document that [...]

So, Linq is supposed to be the future. At least that's what they say. I'll admit, I like it. Right now, I care about how to do stuff with it. There is a lot of great theory out there on the net about it so I really encourage anyone who wants to use Linq [...]