Two great apps, one of which is the audio from a relatively recent production with some high profile American actors!  The other is a good guide to the play.  They are iPhone apps, but will play on an ipad.

http://itunes.apple.com/us/app/cherry-orchard-study-guide/id331233635?mt=8

http://itunes.apple.com/us/app/cherry-orchard-from-l.a.-theatre/id519294344?mt=8