Fanhattan for iPad, the entertainment discovery service, keeps improving and today added three more content providers to its arsenal.

This week's iPad apps took a decidedly backward turn as those about The Civil War, The Wizard Of Oz, and a 15-year-old video game took center stage. But, which was the best app of the week?

PBS fans with iPads got a treat today, an update that fixes several issues and adds a few nice features. The highlights of the update consist of the addition of AirPlay and multitasking support, plus a fix for the audio / orientation hardware switch.

The first episode of Civil War, the 1990 Ken Burns documentary, is streaming free on the PBS app for the iPhone/iPod touch and iPad. It is also available as a free download in the App Store. The episode’s availability, which coincides with the 150th anniversary of the start of the Civil War, will run through April 4.

The Public Broadcasting System has released a free app for the iPhone/iPod touch. It offers free, full length episodes of many of the shows you love.

PBS, the non-profit public television broadcasting service, has joined the ranks of quite a few other television networks by releasing their very own official streaming video app for iPad.