Hud Growl theme from Komodo Media
Several years ago I turned off Growl. I found it to be far too distracting. The little blobs of horribly designed text popping up above my work every few moments reminded me far too much of the Windows' pop up bubble thing. You know, that incredibly annoying yellow bubble that pops up to tell you that you're computer is out-of-date? Yeah, that.
Anyway, the Hud Growl Theme by the immensely talented Rogie of Komodo Media has brought me back to Growl. I've reinstalled it, tweaked the settings to be far less annoying and installed this theme to make my Growl experience better than ever - and valuable.