A couple of days ago I found a really helpful link on the MVV-site. From the site, you can download what they call “Elektronischer Aushangfahrplaene�. These are the timetables of the ubahn/bus/tram which you can print out. I printed some of ‘em out and I keep them in my wallet at all times, and I already used them.
It’s especially very handy if you go in town and have to use public transportation late at night. It saves you either taxi costs or waiting time at the stations which can be up to half an hour at night.

The link is http://efa.mvv-muenchen.de/mvv/XSLT_STT_RE...EST?language=de

Be aware that the timetables are going to change on December 14th!