Included are A&E, Lifetime and The History Channel.
You can debate how much "A" is actually being shown by the Arts and Entertainment network, but there is a slew of popular shows just waiting to be consumed. A&E, Lifetime and The History Channel have all been added for streaming on the iPad though annoyingly, they all use separate apps to do so.
All of the apps are free, as is the streaming. The selection seems to be pretty comprehensive too, so if you're a fan of any of the three channels, you're in luck.