A friend of mine found an excellent resource that I just had to share. It contains code snippets of examples of all the new features within C# 3.0. They are all taken from the book 'C# 3.0 in a Nutshell'. It looks like an excellent book for anyone wanting to learn the new features.
If you are a web developer you would definately have worked with the querystring. Most of the time you are just getting values from the querystring or adding querystring values to url's, but in some cases the querystring can really become a hassle to work with. A simple example of this can be seen in the following scenario :