Well I did something simple for power for my iPhone which is for music and with the I/S i can actually take a call and have it come out the speakers.... course they cant hear me very well at speed, but its there if I want it...
I just went to O'Rielly's auto and got a cheap weather proof (it has a rubber cap to cover it) and it also had a plug on the end that matches the battery tender plug that lives on the bike.... had to splice in some extra wire, but shrink wrapped the connections.... ran the wire under the tank and zip tied the plug to the cables on the left hand side ... right next to the plug for the head set..... I just tuck it on top of the cable bundle when not in use.
I originally had it in the tank pouch i have, but then I had a wire hanging in the way all the time.. better on the handlebar right behind the mount for the phone.....
Its always hot, so if I want to charge something the bike doesn't have to be running... just have to make sure to unplug whatevers in there so I don't run the battery down, but has worked well so far
I think it was like $6, so it was cheap and easy-

The picture isnt that great, but it gives you an idea......
Brad