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How many MP is your camera? I'd always recommend 2 cards over 1, but depending on your MP you might blow through a 1gb card too fast. I know I do on my D200.
I have 1 1gb card and I snap about 50 pictures and then upload them to the computer right away so I never needed a second card. But I'm sure if I had two it would make me a little lazy on the uploading. They'd probably sit on the card for days or weeks.
I shoot the same as Phyl (setting wise) and you can go through memory pretty fast!
I normally go with the "biggest" memory cartridges I can get but more important then size IMHO is memory speed and there is a big difference between many cards. I use my camera for sporting events and rapid successsionso it matters to me. If you just shoot one-up pics like fish tanks then it might not matter as much.
I now have 1g and 2g my wife got them as stocking stuffers two for 35 at costco I plan to use 2g when I'm away from home. thanks for the info guys your the best.