Over at
Rob Galbraith DPI: Home , he's benchmarked the performance of the Extreme IV cards and they
do acheive blistering real-world transfer rates of around 38MB/sec
This is
great news for photographers such as myself whom do our level best to wire images quickly to clients... being able to get the RAW files onto a laptop, perform and quick WB / Curve / EV changes then batch to JPG for transmission (preferrably in a WiFi hotspot) is critical. The quicker I can get each shot off the card, the faster I can go through those stages.
It's been a good tech news day so far: I'm going to install the Lightroom Windows beta on my laptop to see how that copes and I'm looking forward to getting my mitts on a pair of 8GB Extreme IV cards and FireWire readers (one for the desktop, one to travel with the laptop)
... I can feel my wallet's pain already