Adobe has released Source Sans Pro, a fantastic new hyper-functional font, built for the web. Modeled off of traditional gothics like News Gothic and Franklin Gothic, Source Sans Pro works well for both headings and body copy, and comes in a slew of weights and styles (including a great monospace version, currently in use in Adobe’s new code editor, Brackets).
Available for download, as well as on Typekit, WebInk, and Google Web Fonts.