I am curious about your DirecTV situation as I am switching from Comcast in the next few days. I had hoped to run a CAT 5e or 6 to my HDTV frorm my DIR 655. Any suggestion? I have 1.21 and A4 now but intend to use Shareport as soon as I can install the software as we need to print from a laptop with a DWA-160 adapter. BTW, both my laptop and desktop are running XP SP3.
I have a single cat5 running to a 4port netgear hub, splitting one connection to an Xbox, PS3, and Directv. Has been working great, even before I got my DIR-655. We stream Netflix on the Xbox and PS3 (Xbox has it built into the UI and you dont need the BluRay disc in the drive). I get HD video on everything thats advertised as HD. I'm using Comcast for my internet.
With the hub, Win 7 and my DLINK DIR-655 can see the gaming systems and Directv. I did try to swap the hub with a faster router (using DHCP), and my network quality slowed down considerably. And Win 7 could no longer view past the hub.
My Ubuntu box cant see past the hub without some work

But I never tried it with the XP machine.