Good question. There are several factors that went into consideration ...
The books shown are all advertisers (i believe) that have the ability to give us the necessary data for the feed. Some books had similiar feeds ready, available IT resources, etc ...
Some books simply didn't have the ability to produce the feed and others are working on it as we speak and some others have it slated in over the next few weeks.
These books have been nothing short of AMAZING in terms of their cooperations in making this a reality.
We are currently talking with several books, a few that you will see very soon are Grande, BCBets & Royal ... but trust me - others that haven't been mentioned will be along soon too.
It's great that we have this for MLB, but our real test/goal is to have this baby as BUG-free as possible come football season ...
.. we expect a full slate of books, more features, etc ...
Hache,
Any comments, suggestions and/or spotted bugs/defects are GREATLY appreciated by you & everyone else.