@shawnino - It's likely that where ever you're going to go, you'll have electrical current to charge things, but I would want to pack with a common charger to limit the need for multiple outlets.
When I was younger, we didn't have much worry in our electrical components, the meter batteries were small, and the flash batteries were standards, still heavy, but usually disposable. What was a pain was carrying all the equipment, 6 bodies, at least 6 lenses, at least a hundred rolls of film, a tripod, light meter, flashes, and batteries - and that was a minimal kit. Of course, I also carried a field pack, too, that was about 90 pounds, heavier if we were going to out for more than a couple of days. The point of that is that is this, there is light and then there is light.
The gadgets that Adamz and TTJ mentions are handy to copy your data to hard drive as you go to back up, giving you two copies when you return. Not a bad idea at all. Something you should consider. I'm not going that route because I'm sure I won't be trying to sell my images from this trip - it's pleasure. You might weight the cost and the tool against a small netbook, dollar for dollar and inch for inch and pound for pound. It might come up that a netbook won't be a lot more for what it offers - I will throw that out, some netbooks are inexpensive enough and valuable enough to make that a worthwhile consideration.
I'm taking an Android tablet that used to be a Nook Color. All the SD chips are class 10 microchips in SD adapters. None have failed in my P7100, AW100, or D7000, although I don't use them much in the D7000. The places we stay or will be passing through have Internet access where I can put the chip in an upload the jpegs to my Picasa or Flickr account wirelessly. I will likely take a handful of 8/16gb chips for the two P&S cameras, the Android, and a Kindle Fire. Those are the only things that will have battery chargers. The Android is equipped with Skype.
@Adamz We going to Quito, Cuenca, and Los Baños in Ecuador, and Lima, Cuzco, and Aguas Calientes in Peru. We will be there in June for 3 weeks. I haven't been back to those countries in nearly 15 years. We were in Argentina and Brasil a few years ago. You'll like that part of the world. It's very hospitable. In a former job, I did get to travel to all the hemisphere's capitals and environs and provinces, it was quite an experience.
My best to all,