CSS3 Button/Icon set

I've been secretly hoping to see a few of these pop up once the whole icon font idea spread through the nets. I really like this idea and it's a very nice implementation too! I only see some quality issues on a couple of the icons (such as youtube), but it's awesome and I hope to see it in use for the sake of consistency!

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Zocial Button Set: 72 CSS3 Buttons
The idea behind this project was to produce a consistent set of buttons that could be used for the range of social actions frequently taken in Web applications. These actions are often important goals for users, such as connecting third-party accounts or sharing content to third-party platforms, so their appearance has to be attractive and clear.
The standard buttons provided by third parties (such as Facebook, Twitter and SoundCloud) vary in size, style and interactivity. A consistent button…