I carry several CF cards, a 128 MB and a 512 MB (plus the little 16 MB that originally came with the camera). I use a Canon Powershot S30 and bring along the AV cable which allows me to review the shots on the television back in the room. I find this to be a much better method of determining which photos I want to keep. And, therefore I'm able to get rid of poor photos freeing up more space on the cards.

John in San Diego