I just want to add one thing. In the 'family' parameter, you should always include all styles and weights (i.e. italics and bold) that you will use in your CSS - just as you, Jake, did with including weights 400 and 600.
Otherwise the font rendering in browsers will lead to ugly looking 'faux bolds'. On A List Apart http://www.alistapart.com/articles/say-no-to-faux-bold/ you can read: "If text is styled as bold or italic and the typeface family does not include a bold or italic font, browsers will compensate by trying to create bold and italic styles themselves."