Our house was pre-wired with five "multi-media outlets". They're located in the living room, bonus room, master bedroom, kitchen, and patio. Each outlet box has two coaxial cables and one CAT5e cable that are routed to a 14"x28" panel in the laundry room. Each outlet's faceplate has two BNCs, one RJ-11 (phone), and one RJ-45 (data). The CAT5e cables have four unshielded twisted pairs. Where all four pairs are used for GbE, there's no phone line. This hasn't been much of a problem because we mainly use a cordless phone system.
All external services (cable, phone, etc.) are routed to the central panel which houses the security system, punch down blocks, cable modem, router, switch, etc. The WIFI router (acting as an access point) is also in the washroom, but it's on a shelf so it's outside the metal panel.
All computers are running Windows 7 with Media Center. The "Fusion MC" PC receives basic cable, and is connected to an OTA antenna for (HD) ATSC. We can record/watch two channels of each, simultaneously. LiveTV is available on Fusion MC and the XBOX 360 in the bonus room (MC Extender). Recorded TV is available throughout the house. We run both Gb and 100Mb Ethernet as shown in the attached picture, and can also stream recorded TV to the laptop over 802.11n wireless.
Details on the media center PC are available in my profile.