I'm obsessed with the interview series on Code Poet. The latest with core contributor Scott Taylor is one of my favorites to date. Scott is a developer at The New York Times, and formerly with eMusic. He brings a wealth of experience to the table, and he talks about his motivations for getting involved in core development, along with some advice for those that are wanting to get involved. He also talks about tying his passion for music to what he does with WordPress. Great stuff.
By the way, Scott is also responsible for much of the fanciness in 3.6's enhanced audio / video support. So, thank you, Scott.