15 Aug 08 Snarl : Growl-Like Notifications for Windows

Windows only: Free application Snarl is a universal notification system for Windows inspired by the popular Mac OS X notifier Growl. With extensions supporting Firefox, Pidgin, Outlook, Sunbird, and more. Out of the box Snarl has built-in support for battery warnings, system events, and timer and clock support (like hourly reminders)—along with several attractive themes. Snarl is free and open source, Windows only.

(Via LifeHacker)