As of Mon, 09/19/07, Adorama Camera (NYC) still does not have the SanDisk 6GB microSDHC flash card. Their best guess is "very soon."

On a related note, Adorama does now have the new, full-size SD Extreme "Ducati" Edition card (but not the CF version). Not that legacy i730 users particularly care (there would likely be no perceptible benefit except in reading the card externally), but Ducati is the fastest flash module ever made, at 45MB/s read/write (CF) and 20MB/s read/write (SD).

The miniSD and microSD formats have been very slow to adopt faster read/write technology (they're still struggling to add physical capacity at any speed). At sizes of 4GB and larger, only standard-speed (2GB/s) cards are available from any maker. SanDisk's new Premier series of microSD cards (1GB and 2GB only) can operate at 10MB/s read, 9MB/sec write.

In a cam-device (e.g., i760, x6800, etc.), a faster flash card is conceivably of value, as internal memory buffering may not keep up with shooting/saving bursts. For non-cam reads/writes and OTA downloads, a faster card may accomplish nothing for its premium price.
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A murky subject, lotsa confusion; much testing required.

--BAM