Here's a great series of videos from Your Movie Sucks, analysing Synecdoche, New York. Each video goes for around 20 minutes. So far there are 3 parts online, and their creator estimates it'll take another 2 parts to reach the end. (Part 1 hit the web in December; Part 3 in April.)
If you're a film-maker, you might notice that he gets one of his facts wrong about the way the words "SYNECDOCHE, NEW YORK" first appear on the screen; don't worry, he corrects himself at the start of the second video.
This is really cool, deep, astute look at the movie.
Thanks to Max for sending me the link!
Parts 2 and 3 are behind the cut.