SD 4 gig to 16 gig memory cards are currently being made or will soon be made by several memory card companies.
The High Capacity cards are built to a new standard and are not backward compatible with existing cameras.
You have to look for the
logo on the camera.
A few of the very newest cameras can handle SD/HC cards.
Older cameras will require an update to their firmware.
Note: your current card readers will not work with the High Capacity cards either. A special card reader is required. The good news is, the card readers will only cost about $20. SanDisk is planning to include a card
reader with some of its High Capacity cards.
Right now, if you want assurance that a High Capacity card will work with your camera is to contact the manufacturer of the camera.
Here is a SanDisk document:
whats the largest memory card the canon s3 camera can take anyone know? im looking at sandisk 4gig right now more th merrier.