We used really long cables. Since we were remodeling and were ripping out the wallboartd and ceiling anyway, we just put the new cables behind the new wallboard. From our receiver, we ran an HDMI cable, a composite video cable, and a component video cable. We also ran a couple of cat 5 cables while we were at it. We didn't know what, if anything, we would use them for. We also ran a nylon parachute cord between the tv and the electronic components rack in case we wanted to add additional cables at a later date (tie the cord to another cable and pull it through). We installed some kind of flexible, 4" tubing in the ceilinlg that all of the cables run through.
As I recall, we ended up using one of the cat 5 cables for the infrared repeater. We used the other cat 5 cable to attach a webcam to our computer (the computer is located in the adjoining room with all of the other home entertainment system electronic components). We have a webcam on the fireplace mantle, just below the tv. That way we can display the webcam image of whoever we are chatting with on the (52") tv screen above our fireplace. Much bigger, nicer, and more comfortable than sitting in front of a computer screen. The distance between the computer and the tv screen was greater than 16 feet, so we used a USB-to-cat 5 converter thingie which allowed the cat 5 cable to be used as a USB cable.
In retrospect, I don't think it was really necessary to run the component and composite video cables. All we use is the HDMI cable, but that is what we did.
Its a nice setup. We ended up with an Escient Fireball, a new computer, a Sony PS3, a Sony receiver, a Sonxy XBR4 tv, a dvr from the cable company, a turntable, and a computer all integrated together and operated by a universal remote control. We really like it.
One other thing we did was to place a small, 1.5" diameter hole in the wall between the computer room and the living room (wherre the tv is). On the compter room side, the hole is immediately behind the the compnent rack. We put it there just in case we wanted to run a cable, say for playing a PS3 game, between the living room and the computer room. The hole has a nice, removable plastic cap on it. So far, we haven't ran a cable between the two rooms. The bluetooth signal from PS3 controllers penetrates the wall just fine.