SD Cards now come with 16GB capacity. Wow, that is a lot of photos or streaming video. If you are using video, the 16MB may not be enough. So, check out what you want to do and get the appropriate size card.

I shoot photos almost excllusively. My camera is set to RAW so the number of shots I can get per GB is reduced significantly. But who needs to take more than 500 pictures at ony one sitting? Four gigs set at fine is about 1100 photos. So, you choose how many shots you are going to make.