I'm looking for a great resource to become better aware of all .NET has to offer. I'm sure there are a lot of features that I'm not utilizing. I have read Windows-Based Application Development by Microsoft Press but this just scratched the surface of many of the topics. If it could provide further insight on when each method/feature would be appropriate that would be even better (i.e. When to use a hash table vs array list vs collection) I realize there may not be one all inclusive reference. My main goal is to increase my proficiency as a .NET developer. Any suggestions are appreciated.

I have found few books which will tell you "use this when x, use that when y". I have found that the best way to become proficient with topics such as "when to use what" is to start using the "what"s and learn how they work. The classic "when to use what" question is almost always answered with "it depends". It will always be determined by what and how you need to do something.

Get a book that will teach you how to use the classes available to you and you will soon be able to answer for yourself the question of when to use those classes. One of the best resources I have found is the MSDN Library .NET SDK Reference. Spend a few hours looking around in there and you will learn a lot. Something that I used quite a bit when I was starting out with .NET was Visual Studio.NET's Intellisense. You can learn what methods and properties are available on what controls simply by hitting "." and scrolling thru the member's list. If VS.NET is not available to you then the online reference would be a good place to start.

Peter
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Work smarter, not harder