Google has announced that it is bringing 64-bit support to Mac users through the Chrome beta channel



From TUAW:

The new 64-bit version takes advantage of OS X's 64-bit architecture, offering performance and security improvements that are not possible with the current 32-bit Chrome for Mac release. While there are several changes under the hood, the most notable difference to users will be the faster initial launch of the Chrome browser and a decrease in overall system memory usage by the browser.

Starting today, Mac owners can download this 64-bit version from Google's Chrome beta channel. The 64-bit Chrome beta for OS X is compatible with all Macs that have a 64-bit processor, which includes most modern Mac hardware. You can view this Apple support document for instructions on how to locate your processor type and determine whether it is 32-bit or 64-bit.

  Google releases 64-bit beta version of Chrome for Mac