I use AirParrot on my 2009 MBP (17 inch 2.8 GHz Intel Core 2 Duo). It can be somewhat laggy, but works well enough for my purposes.
I also have a jailbroken Apple TV 2, with XBMC and the Amazon Instant Video plugin working. I don't use it often (I prefer netflix, and only have Prime for the shipping benefits), but I have tested it on some episodes of Cheers. So I can confirm that is a viable option as well.