Free Preview Begins: April 6, 2009 (Monday)
Free Preview Ends: April 12, 2009 (Sunday)
MLB Extra Innings will be having a free preview on multiple providers from April 6-12. I can confirm so far that the free preview will be available to customers of Cablevision, Charter Communications, Comcast, Cox Communications, DirecTV, iNDemand and Time Warner Cable.
Check with your provider.