I guess I could help someone with this.
I succesfully took one of these adapters and, after slightly modifying it (filing the side so it's not cardbus notch anymore), I am reading SD, MemoryStick and other types of cards with my Amiga! Certainly cool so you don't have to buy CF cards (usually more expensive).
The reader in question can be bought, in Europe, in the Conrad chain of stores, and it looks like this:
Ran it using the CFD device and Fat95 for file transfer. Probably works with any other filesystem too.