Google has released a new version, 5.0.375.125, of its Chrome Web browser, for Mac OS X, Linux, and Windows. This update is noteworthy because it fixes a number of serious security problems; further details are in the release announcement on the Chrome Releases blog. The new version is available via the usual built-in update mechanism.
Because of the security content of this update, I do recommend verifying that you have it; you can so by clicking on the little “wrench” icon in the upper right corner, then selecting “About Google Chrome”.