The Power.Port 

The Power.Port has been developed to provide a quick release, waterproof,12v power connection into a tank bag, top box or panniers.

Charge mp3 players, phones, cameras or any other 12v gadget safely & securely direct from the bike's 12v system.

This item is also available via eBay. The company has agreed to refund the Shipping cost of £3.50 to Members of SAM, if you quote Solent Advanced Motorcyclist when ordering or on the PayPal payment screen.

This looks a good bit of kit.. I will let you know how good it is, once I have fitted it to my Tank Bag.

http://powerport.net/default.aspx