Google has been making certain fonts available for use on the web for some time now via its Web Fonts site, and now it has released version 2 which brings some major changes.
You have 180 (yes 180!) font families to choose from with filters, search, text samples (words, sentences or paragraphs) and the ability to create your own collection of fonts.
If you are not currently using Web Fonts to build sites, jump on it because now its ready for primetime. You may still prefer TypeKit, which is an excellent resource, but you will have a hard time beating this for the price tag.