4) Going to System Preferences -> Languages & Text -> Input Sources and checking the "Keyboard and Character View" in the list and the "Show input menu in menu bar" checkbox. This will give you quick access to the Unicode characters.
5) In the /System/Library/CoreServices folder is some 'hidden' system apps e.g. Wi-Fi Diagnostics.
1) iStat Menus
2) Menu Meters
3) Hazel
4) Going to System Preferences -> Languages & Text -> Input Sources and checking the "Keyboard and Character View" in the list and the "Show input menu in menu bar" checkbox. This will give you quick access to the Unicode characters.
5) In the /System/Library/CoreServices folder is some 'hidden' system apps e.g. Wi-Fi Diagnostics.
6) Growl and Hiss for Notifications.