HopStop lets you see what people say about bus, train lines, add your own reports

HopStop, a fantastic iPhone transit app that Apple bought in July and quickly updated, lets you watch what people are saying about specific bus, train, and other transit lines. You can also add your own reports of things like service interruptions, incidents,  and suggestions.

HopStop works in over 600 cities. The app itself is free, and transit maps for each city are offered via in-app purchases of 99¢.