Ive been running my 763 for a wee while now and ive got to say its fantastic.
Appologies for the lack of anything tech, this is the everyman's review
I bought the Ipod dock too and aside from a few wee niggles, its amazing. Ill start off with a little review of the dock.
It is an excellent quality piece of kit, looks great next to my amp and suits my black classic ipod as well as my flatmate's purple nano

(he seems to like the colour). It plugs into a designated port on the back of the amp and therefore does not take up an alternative input. You can control your Pod with your Yamaha remote which is great. Its not quite as easy to use as the actual ipod menu system but its good. On the downside it can take a while to pick your track if its high up in the alphabet but its not a chore to do.
The sound quality is fantastic in 2 channel stereo enhanced mode. (i ran it in 7 channel enhanced and it does sound great but i personally feel that 2 channel is perfect when listening to tunes). I personally dont notice any poor quality from the mp3s which are mostly 256kbs. The enhancing facility combined with good speakers and a good sub make the sound amazing!!
The bad points -
1. If you pick a track on the pod and then put it into the dock you have to stop the track if you want to get the menu up on the screen (its a small point but its annoying when trying to show off my amp)
2. There is no playlist making facility within the Ipod control software on the amp
3. There is no random shuffle on the Ipod control software menu either.
The good points -
Everything else
Ok so now to the amp:
Well for everyday use, its excellent, I have my sky HD and Xbox plugged in to the HDMI inputs and one HDMI output going to my TV. The sound for games is just amazing!! The enhanced 7 speaker set up with games like Grid and Battle Field really make you feel part of the game. Cars crashing behind you, in the racing game is an excellent experience.
Movies on sky HD, although not 5.1, seem that way with the enhanced settings on the amp. I have used the Mic to set up my speakers and required a little bit of manual tweaking for a perfect set up.
Switching between my Sky and my Xbox is simple, button 1 is the xbox and button 3 is the sky. I can flick betwixt the two no bother. Its fast and easy system. My TV remote control is now totally redundant as i control the whole lot with my yamaha remote and the sky remote.
In terms of listening to tunes with the amp, it also has great results. A full fat sound is obtained from crappy sources on 2.1 and 7.1 modes. The different sound modes (classical/ club) are also great, although i rarely use them. The hall in munich pre set, for example, really makes you feel like you are there if you close your eyes with some beethoven on.
Power:
This thing is a beast!! I have had it up to full on only one occasion. And my ears were ringing for a day. Its insane. Granted i have some good speakers but, holy shi* its powerful.
Anything above -30db is going to be upsetting my neighbours (i predict - living in a second floor flat with neighbours above and below)
If anyone has any questions about the amp, fire them my way, this is just a quick overview of what i have been using the amp for and how happy I am with it. £500 well spent. I am aware that it can be aquired for less than that but that doesnt bother me as i am so chuffed with it.
On a final note, its probably worth saying that two days after i got the amp, new sub and speakers set up, the people upstairs put their flat up for sale, in such a flat housing market, we can only assume that they are trying to sell because they are so jealous of my amazing system. That and the bass has killed all their goldfish.