Well...this site gives tons of good examples here.
You could also Google them with keywords ".NET design patterns examples" or something to that effect.
When I was learning to use them I was given a book called "Head First: Design Patterns" or something close to that. Another book I was given was one by Martian Fowler called "Refactoring To Patterns".
I would recommend out of all of these places to simply use this site but to actively just demo them in your own way. Create a few stupid projects that honestly mean nothing to you but are your own. create them just so you can first hand implement the pattern.
Keep in mind that patterns are just a way thinking about your code. It is one thing to implement a pattern it is another to implement it knowing why. Patterns not only solve problems but they can introduce them too.
Karl Wessels, Jul 28, 2011