Three interesting posts on theatre philosophies: What's so wrong with proscenium arch theatre?, Noises off: What's the difference between performance art and theatre?, Theater Talkback: Doing Your Homework.
When the living playwright writes about the living then things can get a little interesting. The Play on Madoff, Without Wiesel
The ever popular continuing debate on theatre tweeting: Tweeting At the Theatre
Finally: Two by Wendy Rosenfield: ATCA 2010: Onward Christian Bloggers and Seven Minutes in Hell