Hoefler & Frere-Jones rolled out Cloud.typography today and wowzers. These guys are home to some of the finest typefaces on the planet (I’m a huge fan of Tungsten, Idlewild, Gotham, to name a few).
If you’re a type nerd, at least do yourself the favor of taking a few minutes to peruse the webfont site, and for goodness sake, be sure you read all about the H&FJ Screensmart Fonts and how they designed and engineered them.