Here's a quick update from Lewis L., a member of the AdWords Editor team:

We're excited to announce that AdWords Editor is now available for Mac users. Just like the Windows version, AdWords Editor for Mac allows you to navigate your AdWords account quickly and easily as well as make bulk changes to keywords and ad text. Mac users running OS X (10.4 or later) can download the application from the AdWords Editor website. For a full list of features, check out the release notes section of the website.