Google has released version 2 of Google Web Fonts. This new release includes a lot of great functionality for evaluating and choosing fonts for your web site. You can browse fonts using examples formatted as words, sentences, and paragraphs, to see the fonts in the context you intend to use them. You can also “test drive” fonts, by using a mockup of a page, and seeing how fonts can be combined on your pages.
If you want to see an in-depth tour of Google Web Fonts v2, and see the ways Google will help you load fonts faster, check out this talk from Google IO.