Picking a camera to use with an Arduino uno. (Or freetronics eleven)
Arduino is painfully slow to buffer raw image of any decent size, you would really want DMA &amp; more memory to make it happen (i.e. ARM or FPGA).

But as you don't need any processing - there is a hope: 
There are cameras which have built-it JPEG compression.
So you just need to set it up according to your datasheet.

This way you can capture full-resolution images without having arduino's mind explode.

Here is an example of camera module I am talking about : 
http://www.aliexpress.com/snapshot/101347610.html (I've ordered this but it's not yet delivered)