Please check out the newly launched Kingmax Hi-Speed SD memory cards:

http://www.mobymemory.com/HiSpeed_SD_Memory_Cards.asp

Out of the all the SD cards we have tested with, these offer excellent raw transfer speeds (up to 10Mb/s) and good compatibility with the Windows mobiles, and PDAs out there including the XDAs, iMate PDA2K, HP iPAQs, Siemens Fujitsu Loox and Palm Tungsten and Treos.

These are not standard SD cards (as they are approx 4/5X faster) and should be compared with the SanDisk Ultra range and other equivalent hi-speed cards.

NB. THey will not work in MMC slot devices like the Nokia and Siemens mobiles.

Cheers