Interested to see that with Media Portal with one tuner you can watch or record any or all of the channels that are on that stream (freeview DTT) so for the TVNZ mux this is TV1, 2, 6, 7 all at the same time. ie it can pick up the PID's and store any channel you ask as it is already tuned to that stream.
However in Win7 Media Center it is a bit more brain dead. It only lets you watch/ record one channel per tuner which is a bit lame. So you need a freeview tuner for each channel you wish to record/ watch at any point in time. Can anyone with the release version of Win7 tell me if this limitation has been sorted?
I have got around it by having a dual freeview DTT tuner card and a seperate card with S-Video I/P so I can record Sky SD off my Sky box.