I have been using my macbook pro (2007 2.33ghz 3gb ram) for streaming HD video from my macpro with plex and playing on my samsung 40inch tv. Plex really shines (compared to VLC - boxee) and the MBP can handle the 1080p signal without hiccups. Sold the MBP for $800 tonight and am getting a new one in a few days... wondering if the 2.26 should be enough or I should opt for the 2.53 version with 4gb ram. I know most of the stuttering problems with .mkv files are software related but still wondering with the drop of ghz. (2.33 - 2.26) Im sure it is just as fast due to newer processors and minimal speed difference but am looking for some first hand experience. I only use the computer for PLEX media center, tethering camera in studio with lightroom + canon eos utility, and casual web browsing. Anything else I use the macpro for. Also going from ATI Mobility Radeon X1600 256mb to integrated nvidia 9400M. Thoughts?