Not sure if this is the right place to post this, but I completed a project based on Dave Hilliers attiny45/vusb project.
Using Daves firmware and controller program and a script developed by a friend and adapted to work I have a "can't be ignored" notifier that alerts me to many different social contacts.
http://www.justblair.co.uk/the-attiny45 ... ifier.html
Project writeup here