I made a new version of my mbta bus viewer program. It now takes you straight to a map instead of making you choose routes first. You choose a place, either by zooming or with the text box:

Then when you have chosen a limited view, the "Add Routes" button will only show buses and subways that have stops within the view:

Once you have it zoomed and showing the routes you want, you can use the "permalink" link to bookmark that view.

As before, you can click on stops to see when things are expected to arrive:

And you can click on buses and trains to see how long before they arrive at stops: