>I wonder what the best practice would be when it comes to declare classes (and more importantly methods) static. I have found that in most cases pundits declare non static classes and methods where it would be perfectly workable to have them static.
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>The way I see it is that static is easier to test no?

http://msdn.microsoft.com/en-us/library/79b3xss3%28v=vs.80%29.aspx
Here's what MSDN says.
Basically, I use them the way MSDN suggests.