If your not using Growl, your missing out an a very mac-esque experience. Growl is a notification system that lets Mac OS X applications unintrusively tell you when basically anything thing happens. From finished downloads to new IMs, Growl has got you covered. A great number of popular apps already support Growl and more are being added everyday.(You can find a full index of supported apps here: Compatibility) Growl will honestly help simplify and streamline most aspects of your day while on your mac.  After you install Growl, Many of your existing apps can and will, automatically take advantage of the features of Growl if you don’t already have it installed.

After taking easy of use, customization, and usefulness into account. Growl gets 5 out of 5 ip (internet points) So if you haven’t already, hit up the download link and give Growl a test run!

You can find the download link as well as more info here: Growl 1.1.4