Features:

• Built to perform in the most extreme environments and temperatures
• Designed to meet the critical speed and performance needs of serious professional photographers
• Lets you quickly capture, view, upload and transfer large image files 
• Minimum 20MB/second sequential read and write
• Data recovery software ensures your photos will be there even if you delete them accidentally 

Editor Reviews:

Product Description:
Serious professional photographers who demand one of the fastest, most rugged, and most durable memory cards on the market should choose the SanDisk Extreme III SD card. Built to work under the most challenging conditions, with SanDisk Extreme III you'll get more speed, better performance, and unmatched reliability.That's because only SanDisk Extreme III memory cards feature innovative ESP Technology for the fastest speeds and highest performance. ESP stands for "Enhanced Super-Parallel Processing". Simply put, it means you are getting the fastest read/write speeds available - an amazing minimum 20MB per second sequential read and write speed - speed you'll definitely appreciate whenever you find yourself shooting and storing pictures in harsh environments, extreme temperatures or at high altitudes.Every SanDisk Extreme III SD card comes with RescuePRO so you can recover images, documents, mail, video, music - just about any digital file, with ease. Built with leading-edge media recovery algorithms, RescuePRO lets you preview recoverable data before you try to retrieve it. With RescuePro's unique recovery algorithm for MPEG audio and MPEG video recovery (MPEG-1/2/3) what you see, and what you hear, is what you can recover.

Rating : - Works every time all the time under bad conditions
I have used these chips extensively, they are fast and reliable, and more weatherproof than the camera.They are durable,easy to use and the little bags they come with are easy to attch to a camera strap or bag so I always have a fast and easy to find chip to swap out in a hurry rather than digging in my bag or pockets.
The size is good too. 2G is more than enough and if I use lithium batteries the batteries go right after the chip is full so when I switch chips I switch batteries.Very convenient reminder.Also 2 G is a good size as I don't get completely lazy about getting the photos off the camera in case it gets lost or stolen and I lose the camera and my memories.