This early article on bitcoin by The Economist is one of the better ones:

http://www.economist.com/blogs/babbage/2011/06/virtual-currency

This really depends on the kind of audience you are talking to. Geeks will be more interested in mining and an economist will want probably want to know more about the market and other currency related details. But overall, I like that cnbc article

Be careful how you present bitcoin to people.  Most people don't like to be sold on something and will put up resistance if you try to push bitcoin in a very direct manner.  People are much more receptive when they feel they've reached an epiphany on their own and with bitcoin, anyone that is reasonably intelligent and somewhat literate will ultimately arrive at the same conclusions as you have.  Think more in terms of the movie Inception.  

Bitcoin doesn't actually need any more "marketing" in my opinion.  We already have a self sustaining and growing economy.  People just need to try and spend their bitcoins a little more often than they sell them on the exchanges.  That alone is all that's necessary to keep expanding the bitcoin economy.  If people do that, then bitcoin will be impossible for people to ignore.