I got the bits that I mentioned at the beginning of this thread and here's my take on them:
1. Xbox 360 Quick Charge kit (+ spare battery) - a very good investment if you play a lot! The charger can take two batteries and the Quick Charge kit comes with one bettery so I ordered a second battery separately.
2. Wireless headset. Great idea. You have to disconnect the wired headset from your controller and then have to pair the wireless headset (which is very much like a Bluetooth headset) with the Xbox 360. It takes seconds to pair and then you can use it. I really like the lack of a wire between the controller and the headset but I do find the headset is a bit uncomfortable and, literally, a bit of a pain on the ear! There is another ear loop supplied and i'll try that to see if it's a better fit. The audio quality is very variable (ranging from excellent to very poor) but that may be due to me having a Netgear wireless bridge right next to the 360 which may be causing some interference.
3. Xbox 360 Camera - haven't tried this yet. Will post here once i've found the time to play around with it.