For home automation ideas,
www.smarthome.com. Their 2nd generation Insteon controllers are the shizz-nit. Lots of ideas and product there.
In my 3 year old house (3900 finished sq ft), I have 36 'cable points' each of which have 3x cat5e and 2x catv. There are 2 of these cable points in the main HT center and at least 3 in each room. Don't forget to pre-wire the upper-corners of each bedroom wall for both power and cable so that a TV can be hung from the wall/ceiling. Makes it easy to hide the wiring.
There are a pair of runs in the garage and one in the master bath. There is a weather-proof box on the main deck too.
Everything home-runs to the mechanical room with gigE certified patch panels and the catv distro amplifier. Plenty of rack space there for servers and UPS. Whole house surge protection in the breaker panel. Dedicated breakers isolated from any motor applicances like clothes driers, air compressor in the garage, and the central a/c. Also dedicated breakers for power to the main HT center.
There are 2x 4 pair lines running to the outside wall for POTS (dial tone). I had Quest run an underground 4 pair cable from their service pedestal to the house. The Comcast Digital Voice CPE adapter box is capable of 4 more pair so I'm covered as far as POTS/dial-tone is concerned. Those 8 copper pair connect to their own patch panel in the mech room.
There are three orphan runs of catv cable up into the attic (with lots of slack coiled up) for potential future sat tv dishes. I'm on Comcast cable now but you never know.
Where to put all those cabling outlets? When your home is under construction, make friends with the electricians. They will want you out there anyway to advise/consent on where to put power outlets and light switches. Ask for their help/opinion on all of those cabling outlets. Buy all of the junction boxes for the cabling outlets ahead of time and hand them to the electricians so that the boxes will get nailed to the studs properly. Use different color spray paints to highlight where you want the cabling outlet junction boxes installed. Don't forget to also spec a power point up on the wall if you are going to put a cabling point up there for a TV set.
Be sure to give the electricians plenty of time to get their work done and make sure that there is plenty of time to get all of the low-voltage wiring done. Builders really like to jam work crews in one after the other. So be absolutely certain when the sheet rockers are scheduled to be in and make sure that all of the low-voltage wiring work is done BEFRE the rockers start their tasks. The cover plates and cable termination does not have to be (and probably shouldn't be) complete, but all of the cable runs have to be in, labelled, tied up, and protected (use lots of nail protection plates) before the sheet rock goes up. Once the sheet rock is up and everything is taped, sanded, and painted the cable runs can be terminated and rung out at leisure.
Use multiple colors of cat5e for each leg. If there are three cat5e runs to each wall plate, use blue, black, and green cable for the A, B, and C runs. Or whatever. Stay with the color schemes for the home runs and label everything!!! A leftover spool of cat5e can easily be donated to a school or something but if you screwup your wiring ID plan it will take aeons to sort out.
I did the work myself and used a Fluke NetTool (borrowed from the office) to ring out each individual run and certify for gigE. The whole install cost a hair less than $1000- including the two switches, catv distro amp, the patch panels, patch cords, outlet boxes and faceplates, and over 5000 feet of cat5e and catv cable. Used lots of nail protection plates (ask your plumber). Took about a week to install working 3-4 hours each night after work. With a competent helper the install could have easily done in one long day.
Hint: Take pics of each cable run in the walls before the sheet rockers get in there. It's always nice to know exactly how the low-voltage runs go.
Hint x2: Establish a wiring ID plan using both labels and color-coded cable and stick to it at all costs!!!
Hint x3: Don't cheap out on switches.
Hint x4: re item 3. Ditto for network patch panels.
Hint x5: re items 3 & 4, double-ditto for catv distro amplifiers.
Hint x6: Wireless of all kinds sucks dead bunnies for any and all kinds of AV distribution.
Hint x7: If you find it in the trash, it probably belongs there.
Hint x8: If you do not have the skill or attention span to do it right, contract it out.