The ACM SIGPLAN 2011 X10 Workshop featured a 30 min "X10 in a Nutshell" presentation by Vijay Saraswat.   The video for the presentation is below in 3 parts.  The slides can be found on the workshop webpage.   The workshop featured 11 other projects working with X10.  In most cases the slides and associated paper are available on the workshop webpage.

Part 1

Part 2

Part 3