Im going with USB camera to Africa too. Im taking with me exstra memory card, so if you have a frend, that have dig. cam. let him blend you exstra mem. card. But be carefoul, becouse there are 4 tipes of mem. cards and not all of them are good. Sony is heaving memory stick that is almost indestructible.
For others I dont know. If you buy dig. cam. with 1.3 MP then you need 64 MB card for 100 photos, if you buy better, pictures will be better, but you will need biger card. Of course you can check for bed pictures and delete them. So if you have place for 100 pictures, all of them will be OK.
I will take with me blank CD and hope I will find some internet cafe with CDRW to store my pictures. Sending them on internet it would take to much time.
I dont know where you are going, but they have CDRW in Tunisia.