I'm with popecrunch on this one: split-loom tubing and 3M Command Strips. My wife taught me about the latter and frankly they're awesome. Need somewhere to hang something? 3M Command Strip hook. Put it in the wrong place or no longer need it? Fine, it peels right off with no marks left. We've use these for hanging pictures, clocks, smoke alarms, dressing gowns, towels, utility cupboard stuff (including an ironing board), and I even have two on my desk in the "office office" for headphones and keeping the slack from the headphone extender cable tidy.

Also, after a week of sharing home office activites with Mrs. Waider where both of us need to make regular confcalls and generally do a bunch of Internet Stuff, I also strongly echo keeping wifi for things that are mobile, and plugging everything else in to a handy ethernet port. I use a bunch of ethernet-over-mains for this, and it's rock solid, as opposed to the WiFi which can occasionally fade out because someone's using the microwave or the neighbours just started watching Netflix or whatever.