I've created a meditation timer application. It's available at www.trance-formation.co.uk/meditationtutor.html

The application itself is free and if you simply want to use it to time meditation sessions or to use the basic breathing meditation session, no further purchase is necessary:-)

Adam Sargant
"We are not human beings having a spitual experience, we are spiritual beings having a human experience." Teilhard de Chardin