According to the Google Developers Blog:
Download and Install Google Fonts
First download the SkyFonts tool for Windows or Mac.
Extract the zip file and run the SkyFonts installer. It requires .NET Framework 4.0 which you’ll be prompted to download and install if you don’t have it already.
One caveat to keep in mind is you’ll need to create a free account with fonts.com for the ability to download and sync new fonts from the app. If you don’t want to create an account and use SkyFonts, you can download fonts directly via the Google Code project.
SkyFonts runs in the background to make sure you have the latest updates. To add new Google fonts to your collection, right click the icon that lives on the Taskbar and go to Choose Fonts > Google Fonts.
Your default browser will open to the collection where you can browse through and add them to your collection. It would be nice if there were a way to download them all at once, but still, if you use a lot of fonts during the day, this gives you a lot more options.
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