In 30MB how many pictures can you have on your digital camera?

Depends what camera you have, and what you have the camera set to. Shooting in RAW on my camera, each photo is between 20 and 25MB. Shooting in JPEG you would be able to take a lot more. In small mode on my camera a photo will be about 1 MB. You be best off buying a much bigger memory card, maybe 2 GB if you won't be shooting a lot of photo's. I use a 2 GB and an 8 GB, just to make sure I have enough room when shooting gigs.