Though it might be interesting to know what people are using for configuration to run the media server on, and what settings you are using.
I'll start off with what I'm guessing must be in the very low end of the scale.. :
A almost 10 year old 548Mhz PIII with 768Mb RAM.
Network is 100Mbs wired.
I honestly did not think this would work at all but to my suprise I've actually managed to watch a couple of 720p movies on it. Of course the CPU is maxed out and no one can even look at the PC before it starts stuttering, but still! To get this to work I had to set it to use the TsMuxer and changed to stereo sound, everything else is pretty much default values as I'm really not qualified to change anything..
So let's hear it, what are you using and what's your settings?