When asked by Google, it said that Mac and Linux versions are in development and will be released soon...
Using Chrome’s codebase, developers over at CodeWeavers have created CrossOver Chromium, which is a Mac and Linux port of the open source Chromium web browser. It runs the Windows version of Chromium natively on both Mac and Linux.
CrossOver Chromium on Mac OS X
CrossOver Chromium on Ubuntu Linux
Download CrossOver Chromium for Mac and Linux