I am finally watching my mythtv recordings on my windows laptop. I have been wanting to do this for a long time, but there were some problems, mostly the mythtv windows clients were in beta and since the switch to digital, they did not handle streaming hd well. The solution is MythWeb and streaming flash.
MythWeb is a web browser front for Mythtv. I had to install mythplugins using sudo apt-get install mythplugins , (I am running ubuntu intrepid ibex on the Mythtv box) then it pretty much installed itself. MythWeb will allow you to download the complete show as well, but I really had no desire to wait for 2 gigs of "Antiques Roadshow" on WiFi. Anyway, the latest version of MythWeb has an experimental flash converter that seems to work pretty well. It encodes the show to flash on the fly and you can watch it. It was a little jerky on occasion (not sure whose fault that it is), but it is very watchable. I've heard the flash encoder does not skip commercials, but since 90% of what I watch is PBS, it doesn't matter to me.
So now, I can relax and use my eee to watch my shows.