Mac OS X 10.7.4 (Lion) was released yesterday by Apple. Even if you aren’t a Mac gamer, you should grab this update anyways, since it contains security fixes/updates, and updated Safari, and for those in Great Britain, it improves the compatibility with certain third-party British USB keyboards. A lot of gamers use other keyboards – this might fix a few issues they are having.
Links:
– First off, you can install it through Software Update
– If you want the actual download, see the Apple page
– Detailed Information about the update