In short, I recently released a simple app for local transit system and I want to promote it without spending any money. How would you do it?

When I moved here a few months ago, I made this app to make it easier to find bus schedule. I found myself using it more than I expected. So I took some time to finish it and submitted it to the app store. I don't _really_ care if not many people download it, but at the same time it would be nice to see people benefit from the app.

For those who are interested, it is for London Transit in London, Ontario, Canada. http://itunes.apple.com/us/app/ltwatch/id482807766