I can confirm the same behaviour on the same hardware with kernel 3.0.0-1-686-pae from unstable.
(In the "workaround" situation of booting with a card in the right-hand slot, everything works as expected: both cards can be inserted and ejected and generate the expected udev events. Subsequently, the first card to be inserted is always /dev/mmcblk0 regardless of physical postion.)
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