Census taking off the grid

We're writing software for child spon开发者_运维技巧sorship organizations that need to collect data in remote villages (no electricity). Our idea is to use a small device to enter childrens' names and when the agent gets back to an Internet cafe, they can upload the data.

Our thought is to use an XML file to store the data. What device can you recommend for doing this?

I'd use a TomTom GPS with an SD Card and store each child as a favourite and then extract the info from the SD Card on a smart phone, or write a custom plugin for the TomTom to sync over bluetooth via a smartphone.

Edit:

It's also just occurred to me that an Android device may be more suitable because of the longer battery life. Obviously you'd need to write a custom application to capture the info - whereas the TT you could use out of the box. Either way having something with a GPS receiver could help.