While looking for information on multi-threaded debugging for Visual Studio 2005, I found this article by Peter Bromberg that has some decent Visual Studio 2005 debugger tips.  Its definitely worth reading over if you use Visual Studio 2005.  I know I learned a thing or two.

One tip I would add to this article is to use the immediate window when debugging.  It seems like all VB'ers know about this one, but relatively few C# developers do. 

The immediate window allows you to evaluate code while debugging.  Lets say I wanted to print out the value of a property in the immediate window, I could do any these expressions:

I find this is often faster than trying to dig through a watch window, especially on a large class.

You can even call code directly from the immediate window, which I think is where it's real power lies.  With this you can create a generic debug method in your code that prints out all the values of a collection, which can then be called from the immediate window passing in any collection.

internal static void PrintAll(IEnumerable coll)

{

    foreach (object item in coll)

        Debug.Print(item.ToString());

}