A 4GB SanDisk Extreme III card can store more than 2,000 high-resolution pictures or up to 8 hours of MPEG 4 video. Major camera manufacturers, including Canon, Nikon, Panasonic and Leica, have already shipped or announced a variety of pro-level digital still cameras that use the SDHC format, which is designed to allow for capacities greater than 2GB. Consumer-oriented digital still and video cameras that use standard SDHC cards have been available at retailers since last year. Devices must be SDHC compatible in order to work with SDHC memory cards.
The SanDisk Extreme III 4GB SDHC card has a sequential read/write speed of 20 megabytes (MB) per second, while the SanDisk Extreme III 4GB Memory Stick PRO Duo card has a sequential read/write speed of 18 MB per second. Both cards are designed for shooting in extreme temperatures (-13 to 185 degrees Fahrenheit or -25 to 85 degrees Celsius), high altitudes and other demanding situations.
SanDisk Extreme III SDHC cards have a speed rating of Class 6, the highest available, meaning that they have a minimum continuous data transfer rate of 6MB/second. The speed rating system, adopted by the SD Association, is intended to help consumers select the right card for the desired application. It does not denote the fastest memory card.
All SanDisk Extreme III cards offer ESP Technology to streamline data transfer, RescuePRO software to recover accidentally deleted files and images, a dedicated technical support telephone hotline and a limited lifetime warranty.
Pricing and Availability
SanDisk Extreme III SDHC Bundle, 4GB + MicroMate USB 2.0 Reader: $139.99—April 2007
SanDisk Extreme III MSPD, 4 GB: $179.99—April 2007
Bought one from memoryking.com great product!! 
