OmniGrowl is a framework for sending Growl Notifications, for applications that do not natively support Growl.

Features:

• Notifications for upcoming iCal events, to-dos, and birthdays
• Notifications for Address Book birthdays & events
• Fully-customizable news headlines (RSS)
• Local events powered by Yahoo Upcoming
• Concert notifications through pollstar & bandsintown & last.fm
• 4Info searches for horoscopes, stocks, sports scores, etc.
• Yahoo Weather
• MapQuest Traffic
• Flight status for flights entered in iCal
• Notifications of iTunes track changes
• AMG artist biographies
• Woot and MacZot deals
• OED Word of the Day
• Fully-customizable log monitoring
• Much more!

Requirements:
OS X 10.6+
Intel