Might however be worth considering running some cables under the floor in the living room for speakers, with the bigger shift towards home entertainment, even if you don't use it, might be a plus point when you come to sell? and it's easy and not expensive to do when you have the place apart anyway?
Also I expect phone isn't so much of an issue with the digital cordless phones out now, does anybody use wired phones now?
In my parents house, we kitted that out with a full network and routed a lot of things over cat5 including A/V, just remember you can never have enough RJ45 sockets, my room had 4, we even had some in the utility room in case we got network attached washing machines/fridges etc (OK maybe a little overkill!)
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Also maybe worth putting a socket and power in the attic in case you want to put a server or wireless access point up there out of the way?
Just some things to consider?
EDIT: I think you can run HDMI over CAT as well?
And on a slightly different note, one thing I have always wanted to do is have a usb key holder, so the USB stick on your key ring automatically syncs with the server
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