The Exilim EX-Z690 supports an SDHC memory card which is better than the SD memory card supported by most digital cameras of a similar type and age to it. In addition, this Casio digital camera supports an SDXC memory card. SDHC cards are DS hards with a higher capacity of up to 32GB. The best memory card type of all similar spec digital cameras that have been available for around the same time as the Exilim EX-Z690 is SDXC and the worst is Eye-Fi.
We think you might also be interested in some of the alternative cameras that support SD, SDHC and SDXC memory cards currently available including the Fujifilm FinePix S4800 (£234.06), or the Casio Exilim EX-ZR400 (£309.00) which has a better Rating.
If you want a digital camera with a better memory card type then you might want to consider the Panasonic Lumix DMC-FZ200 (£299.99) (SD,SDHC,SDXC), or the Nikon Coolpix A (£292.99) (SD,SDHC,SDXC) which also has a higher rating.