Great Coding Guidelines Document

I came across a PDF document (you can see it here) that I think is very useful in not only detailing coding guidelines but also explaining why the guidelines are there in the first place. It also talks about other stuff like when you should use an interface instead of a abstract class or when you seal a class. It also has good sections on error handling and commenting.

Also, in case you did not already know, on Visual Studio 2005 if you right click on your project node in the solution explorer and select the Coding Analysis you can run a check on your own code. I have found this to be very useful in not only correcting my own mistakes but also learning good practices.