Google Desktop in Firefox
While Google says that Internet Explorer is required to use the new Google Desktop Search, intrepid developers have released the Firefox Toolbar that extends the Desktop Search to the Firefox browser on Windows and the Google Toolbar to Firefox on the Mac. This new toolbar allows one-click access to Gmail and the ability to search your Gmail account.
Adding Google Desktop Search to the toolbar in Windows requires an easy
"hack" but it is one Google themselves provide to add Google Desktop Search to their own Deskbar. I've hacked my Google Deskbar and it works fine.
The Firefox Toolbar works with Firefox 0.9 and the PR1 release.
NOTE: This post has been updated. I originally indicated (incorrectly) that this toolbar enabled Google Desktop Search on the Mac. As a reader pointed out in the comments to this post, Google Desktop Search requires an .exe file that is currently only available for Windows 2000 and XP. Sorry for the error.