The Roku box allows for those of us who don't have a web enabled TV to stream instant media such as Netflix, Hulu, Pandora and other services, the cheaper version remvoes the SD expansion slot and also doesn't have the bluetooth capability.  But it's not a bad deal.  You can purchase from http://www.roku.com/and http://www.amazon.com/ , if you are a prime member you automatically get free 2-day shipping.