i was cleaning up my home pc this weekend and found these bookmarks i collected during my 4+ years in the Stuttgart area (Esslingen). I'll post more when I get them sorted out.

www.kelleytheatre.de shows english languge plays, musicals for the whole family, but it is located on the military base at kelley barracks in stuttgart-möhringen (near to SI center). you have to usually reserve tixs a minimum of one week in advance. it's actually a pretty professional community theatre. it's easy to participate too.
http://www.neat-theater.de/ is a really, really, really small theatre troupe, but they're consistent and talented.