Some bit of information for future generation - tested my new Sandisk Extreme III Memory Stick Pro-HG Duo 8GB with A900 (I wonder what are they thinking about when giving those terrible long names to cards?). It says 30MB/s on the card and it actually gives about this speed in camera. It's faster than my Transcend 16GB x300 UDMA.
I'm very surprised - they actually printed meaningful speed on the card!