Hey guys... i must say i was getting nervous after I ordered my series 6 Samsung and read all the difficulties connecting to play media from the comp. But seems I found a way.
I have Series 6 Samsung # ...650
IMAC - Snow Leopard X OS
I downloaded Eyeconnect to my IMAC.
Connected my Samsung TV to my Airport Express via Ethernet.
The TV found connection instantly....
And through Eyeconnect... I can play all MP3 Audio, MPEG4 Video, and view all my photos from IPHOTO.
I was amazed at how fast I got this to work after reading all the trouble many here on this forum, and elsewhere,were having.
You just have to make sure you have your wireless netwrok set up properly with your MAC, wireless router, and your AirportExpress. Also it only regonized MP3 format for audio and MEG-4 for Video, photos had no problems.
You can download, or buy really cheap video conversion software to convert your videos to MP4 to stream to your TV. I used Roxio Crunch to convert my Vids and they ALL WORK!!
Love this TV and my MAC accessories AA HAA

good luck all...