vash - if you get a chance, please post a benchmark (measuring the read performance) for your card in this* thread.

Unfortunately I don't have a reliable method to benchmark write performance (anyone got any suggestions?) It would be interesting to measure the real-world write-performance across class 2, 4 and 6 cards and even compare same class cards from different manufacturers, but ultimately I doubt we'll notice much difference in practice. Read-performance is likely to be the most important factor when purchasing a card (I'd definately avoid SanDisk as they don't seem to support a high-speed bus).

* The timings in the thread remain accurate even with the latest 3.2007.10-7 firmware and updated SDHC 3.2007.10-7 kernel ("kernel mk4")