Ok - thanks for the responses, I'll pass on that idea till I find a reliable adaptor.
My plan was to rationalise all my memory cards to micro sd, as they are reliable and economical. I usually buy Sandisk. Have had bad experiences with Transcend SD cards in the past. The last CF card I bought was a Lexar x300 16GB, still use it, but seems to slow down my D300 intermitently, the Sandisk Extreme III is more consistent, but not as quick as the Lexar.
I just recently ordered a Sandisk 32GB Class 10 micro SD card for about £22 from play. Their equivalent CF card is closer to £50. Having said that I've been known to splurge on Portra and Tri-X, plus you can't re-use them.
I'm going to stick with Sandisk.