Well, I couldn't resist. Happen to be walking by a camera shop on the way home and they had a Fuji 1gb H card for just US$35. Did some unscientific tests comparing the 1GB H xd card to my 2GB M xd Card and yes the H card is noticeably faster if you set the F30 on continuous shooting. As for firing off single shots, just a little faster but not that much. But again, the F30 only shoots 6mp jpg's which are less than 3mb each so the internal 10mb buffer can handle a few shots in a row and you'll see the light turn to green "ready" after each shot almost as fast as the H card. Haven't tried a video test. If the F30 created 5-9MB size RAW files, then the speed difference would really be noticeable.
I guess curiosity got to me. The silly thing is the 2GB card can store 680 shots in highest quality and don't really need the xtra storage...