Rocky Lhotka wrote an exceptional post on what Indigo could mean to distributed computing. It is a great summary of why Indigo could be The Next Big Thing in this space. I also watched the Introduction to Indigo MSDN TV episode. Very well done. Lastly, the reference to Indigo on MSDN contains some valuable information, too.
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.