SanDisk just released their new Extreme III PRO-HG Duo cards capable of speeding up to 30MBps (read and write transfer speeds). This is obviously not for newbies using their cameras on vacations. In June when it should be available, the price for the 4GB model should be $90 while the 8GB card should be $150. I suppose those professional photographers using them, wouldn't mind paying. 
Just for the record, the non-HG Extreme III cards go up to 18MBps speeds.
SanDisk via Electronista
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