I'm planning on doing some travelling and I thought it might be useful to have some kind of PDA/netbook/phone that I could use to book travel, accommodation, send pictures/videos back home, etc.. What's the cheapest way to do this? Which type of device would be best? Sending pics/vids isn't anywhere near as important as the other stuff but it would be nice to at least have somewhere to store that stuff rather than relying solely on a camera's internal memory.