In preparation for that, I did the whole "get CAT6 networking to the new location" thing, which has involved re-acquainting myself with our crawlspace. Spending my days crawling around, hoping I'm not going to encounter any dead mice (or live ones, for that matter).
I obviously already had cable going to various locations in the house, but the way that had happened, I'd done them one at a time, and my current office ended up being the hub for it all. And since I really wasn't going to re-route all the cables and make the new office be another hub of chaos, and I certainly wasn't going to leave the hub in what will become a kids bedroom, the above is the result.
Beautiful it ain't. It's a real media center enclosure, but the networking hubs that are meant for those things are overpriced and generally just pitiful 4-port 100Mbps switches with dubious firewall capabilities, so I'm just installing my own. And some day, I'll actually add the screws that hold the boxes where they are supposed to go, rather than just sitting in a pile on top of each other at the bottom of the box.
I haven't had the energy to fix the telephone wiring. As you can see, I now have the header for getting that particular mess sorted out too, but I'm not the person who created that particular "rat king" of cabling under our house in the first place. So I'm not feeling the need quite acutely enough to spend another few hours crawling around straightening out all that wiring. Same goes for TV cabling. You can kind of tell what part of the house wiring I actually care about...