Google today made another new release of its Chrome browser, version 12·0·742·91, for all platforms (Linux, Mac OS X, Windows, and Chrome Frame); just yesterday, Google made a Chrome release to update the embedded Flash Player. This new release incorporates fixes for 15 identified security vulnerabilities. It also includes a number of new features, which are detailed, along with the security fixes, in the announcement on the Chrome Releases blog. There is also a discussion of the new features on the Official Chrome blog.
I recommend installing this update as soon as you conveniently can. Windows users can obtain the new version via the built-in update mechanism (Help / About Google Chrome). Linux users should be able to get the new version using standard package update tools (e.g., apt-get, synaptic).