I got the TV up and running. The converter box seems to work, aside from having to be told to go to HDMI every time it's turned on. We watched a video, but haven't tried a BluRay yet.
We need to sign up for cable TV now. Originally we thought we could make do with broadcast, but I've now realized I have no way to run broadcast sound through my amplifier to my surround sound system.
I put in a CD - "Dreamboat Annie" - and the PS3 went on-line just so it could tell me the names of all the tracks. Kind of helpful, actually. I had forgotten how many tracks suck on this album. I only bought it for "Crazy on you," anyway.
Next step is to fire up Guitar Hero!