Popcorn Hour: http://www.popcornhour.com/onlinestore/
CinemaTube Mini: http://www.brite-view.com/cinemago.php
And of course there’s always the PS3, Xbox, and many others. These are just the most popular right now.
There’s also apps like iMediaShare for Android that allow you to play media on your smartphone from any DLNA media server (I like http://code.google.com/p/ps3mediaserver/ personally).
I’ll be adding to this list eventually as I find more products.