I have both a Dbox and a pccard, and I was waiting for any news regarding this development...
I tryed streaming directlly (dbox->770), but it doens't work because the 770 doesn't accept mpeg2 streams... so I guess they need to be transcoded "on the fly"... and that can only be done on a pc..
( it could also be done on the dbox.. but it doesn't have enough CPU power...)