a little thing to keep in mind. The Extreme SDHC card line was bumped to class 10. this was a blind roll and the SKU was not changed. If you are ordering online they may have older pictures up and you may receive a class 10 card. Only way to be sure it is a class 4 card will be to go into a store and physically look at it. Or just see if the camera can use class 10 then you dont have to worry.
The Extreme III cards were older and replaced with the new Extreme. I know it seems backwards but it is the case. Extreme III cards will generally be 20MB/s cards but the ones produced toward the end of the life cycle of the product are 30MB/s cards.
