If you think I should be shouting 'awesome' and similar words like most of the .NET community members, please take a walk down the path of 'licenses', something you all should be familiar with in every cell in your body, but by the look of all the different posts about this source release I can only conclude: hardly anyone has any clue whatsoever what licensing, copyright, software patents and related material really mean to a software developer. You didn't really think that by copying a class from the internet you owned the code, did you?
If you do framework development, take my advice and don't look at the .NET 3.5 BCL sourcecode. Using reflector isn't the same, you're then looking at IL being reversed engineered. Looking at sourcecode is different: it has comments, it has other layout, it has real variable names etc. etc. Also, use reflector only when you really have to. Using it is technically breaking the EULA.
Why you shouldn't look at that sourcecode
The reason is simple: software patents. People in the EU, where software patents are, fortunately, still not valid, should still realize that in other countries they do exist, and if you're writing software which could be sold in the US, don't make the mistake your code is liable to this. The jurisprudence on 'reverse engineering' is based on the fact that the people who are allowed to reverse engineer code have never layed eyes on the real code. As soon as they do, they can't reverse engineer the code anymore to their own benefit (whatever that may be, even rewriting code because it's internal in the BCL) because their case would fall outside the jurisprudence: it can be assumed they might have just copied the code instead of reverse engineered it.
Microsoft, .NET, Development, Source Code