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What articles if any have been in the mainstream media about bitcoin?
The most up-to-date list is the Bitcoin press hits thread. However, if you want a shorter list with more quality content, I recommend Press page on wiki.
The most complete list I'm aware of is the Bitcoin press hits thread at bitcointalk.org . But be aware that there is a lot of content there to sort through. BitCoin has been covered repeatedly in Forbes, Wired, the Wall Street Journal, the Times, etc.
BitcoinTalk has a Press board dedicated to discussing news articles. Each article has its own thread there, which amounts to about 7500 articles by now.
A lot of articles are also linked and discussed on r/bitcoin, although they don't make up the brunt of the topics there.