A year ago, I ran the numbers on the SanDisk rebate program of the season. Extreme III CF 8GB cards had the best MB/buck (after rebate, admittedly) of what they had, so I went with three of those. I picked up some Extreme III SDHC 4GB cards as well, and they're good, but to me not amazing. The amazing thing is how much faster the SanDisk SDHC reader reads them compared to my no-name multi-format (but not SDHC!) reader reads.