Indigo Swing is best if you are doing Lindy Hop (8-count patterns), so if you are just starting and are doing ECS, you might prefer something else- try Glenn Miller, Count Basie, Duke Ellington (all the oldies... They're still great!)
Also, there is a cd out called "Swing Sucks" I know it doesn't sound great from the title, but if you want something that gives you a sampling of a lot of new swing bands, it ROCKS! There are lots of other good compilation cds, but this one is the best.
While kind of fast, Big Bad Voodoo Daddy, Brian Setzer, etc. are great. Royal Crown Revue is a pretty good band too.
Oh, and don't forget the Swing Kids soundtrack. If I had to choose three swing cd's for the rest of my life, it would be Indigo Swing's All Aboard, Swing Sucks, and Swing Kids.