LEDnotify
USB LED Alerts - for gmail, email, pidgin, etc...
... for download
2013-08-29 - V1.1.7 : In progress - see blog
2013-08-09 - V1.1.6 : Uploaded
2013-08-07 - V1.1.5 : Uploaded
Originally based on dBird notifier :
http://dbirdnotifier.sourceforge.net/