This was a very useful application when I was traveling Italy in May 2009. Using my iPod touch, it allowed me to easily check schedules whenever I had access to an open wireless network. It would give me the available times as well as the expected cost, so it really saved me from having to spend time at an Internet cafe or compete for computer time in the hostel. I was fortunate to get the app early when it was free, but with any decent amount of traveling, the time you save will be realized very quickly. The schedules it provided were exactly the same as I found at the train station kiosks.
mblitch about iRail European Rail Timetables