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SD Tools app from the Market! My Class 4 8GB Sandisk Mobile ultra gets 8.2MB/s write and 21.2MB/s read.
Also, om nom @ this possibly:
http://www.mobilefun.co.uk/genuine-samsung-galaxy-s2-i9100-kick-stand-case-black-p28953.htm
That's really good my class 10 card gets 9.8MB/s write and 21.8MB/s read!