Thanks for your replies, everyone. They give me a much better idea what the storage capabilities are.
I don't think that I would be using it much for pictures; I tend to use my laptop for that because that's where I have all of my photo editing programs loaded.
Does the iPad have a good enough speaker system for music playback? I tend to use my Sansa Fuze with headphones, and my Nokia 5530 has speakers so I also use that for music playback.