Well to wall mount a TV you'll probably have to do some wiring to get a power socket located half way up the wall and power into the cupboard housing your gear. You could run wire cables back to the cupboard at the same time. Then the only remaining issue is to set up an IR repater to send signals back into the cupboard so you can control your gear without seeing it.
(Check enough ventilation for your gear in the cupboard, maybe cut some holes in the roof of it if possible)
There were some products launched at last year's CE show in Las Vegas but they were pretty cutting edge if you are trying to move HD video and this year's Sony XE (or is it EX ?) series TVs do this. But if all you are after is to send analogue quality AV to the TV there are heaps of AV senders on the market that include IR control links as well. But depending on the size and resolution of your tellie you may be disappointed by the result.
Areas of Geek interest: Home Theatre, HTPC, Android Tablets & Phones, iProducts.
As Jaxson already said, you'll be running power to the TV anyway so you're pretty much committed to making some holes unless you want a lovely power cable hanging down to the wall socket. Running HDMI and a couple of other cables in the same wall cavity shouldn't be a biggie :)