Comment Options (Score 1) 323
To keep computer cables managed, I'd suggest you simply bundle them together, and where possible, get shorter cords or wrap them up. the monitor, box, and printer cables can generally be consolidated fairly easily, and that's just a start. You can also get away with bundling data-carrying cables with each other (yes, I know, RFI, but you'll get more RFI from power cables).
Three computers and their connecting cables: go with wifi internet where practical (G or N, you're not actually hosting anything, are you?) As far as the utility cables, I'd suggest cable bundling where practical (you wouldn't bundle that wired mouse, for example, but the keyboard? probably.)
Two cellphones? Phone charger plugs were standardized around USB not too long ago, and with those, you can ditch the wall plugin by getting a simple adapter cable. Even the USB-to-proprietary adaptors would clear up a bit of wall adapter mess.
Video and Photo cables should be bundled as well, and as for their proprietary chargers/cables, tuck them away neatly.
Printers are fairly easy to keep neat, especially if you have a print server. It's not hard to do. For that matter, external hard drives tend to be practical with a single fileserver, because it keeps the extraneous clutter managed, and it's consistent to access. For three computers, do you really need two NAS'es where one will do well?
The phone system should be fairly straightforward, but if you're looking for reducing cable clutter for an office workspace, I'd personally go the cell phone route.
Audio systems go two ways: wired, or wireless. I prefer very low lag in my sound, so I prefer wired, but that's my preference. Either way, you're talking about hiding either power cables or the audio wires to your speakers, and those aren't that hard to hide. Do keep them hidden, and not crossing any traffic though, no matter how much better it might sound with it placed a certain way.
Routers and switches are nice and all, but so is the ability to go wireless. Choose something that will get you the least interference and the best signal (I've been happy with my DD-WRT), and choose a good channel (avoid those overcrowded factory settings channels like the plague). Sure, you'd lose an expansion slot, but you'd also lose those cables, as well as the hazards those cables bring with them. Go with the N standard if you have interference issues where you are at, because so few people actually have wifi-N to interfere with you.
If you'd like to watch your power consumption, get one of those load meters. They'll help you figure out whether or not it's those idle bricks that are pulling more power, or that idle photo printer. The wireless router may pull a good draw though, I'm not sure.
In general, my own cable mess is tucked neatly out of the way. The things I use (like my cell charger) is accessible, on the desk, attached to my USB hub. My printer is easily turned off (and stays off for the most part), as is my monitor (max power saving is good).
You can tuck those power strips anywhere, including under furniture (properly insulation is a good idea). Power bricks are harder to hide, but they can be put with them (and hot bricks should -always- stay where they can at least maintain a good temperature). As such, I tend to avoid the cabinetry, since my laptop brick can get scalding hot sometimes, and tend to opt for the behind-the-cabinet approach, where if something does go wrong, I can take care of it. Forgotten surge strips are useless surge strips.
Use your intuition, and be safe!