I travel with a Kensington Power Adapter. Small & cheap on ebay (the 70W model does the trick).
I use it to charge nearly all my electric devices. It connects to 12v as well as 110/220V. A complete no-brainer if you ask me. And the cable that comes with it is even long enough to run underneath the seat-bench (so you could wire it to the bike permanently).
I use it to charge:
Mobile phone
iPod
Laptop
For digital SLR batteries: I got a 5D and bought a charger from sterlingtek.com. It runs off the bike AND 110/220V. It's small, square shape (the power-plug 'swivels' inside for transport), and it serves as an emergency torch (2 LEDs built in, powered by the camera battery).
Bjorn
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