Bruce Galpin put together this great repository of Google+ Style Buttons - enabling anyone to easily integrate the button styles from the latest Google redesigns into their own work. The icon set from WebDesignShock is particularly nice.

While I really love what Google has been doing design-wise lately I'm not a huge fan of the idea integrating their buttons into anything else as they seem so exclusively Google. However, they do provide a common visual language for just about anyone using the web so it could be beneficial to an overall more pleasant User Experience. Worth pondering for a moment at the very least... and there's no way to not like that icon set.

HT Daniel