different question
The question WAS a little bit different actually than just, "IS there an expresscard SDHC adaptor?"
It was, IS there one that works?
I had had a LOT of trouble with the various SDHC card adaptors, some brought on crippling kernel panics, others had very poor data throuhgput. I don't remember the chipsets that caused the problem, but there is a longer thread on THIS forum that details it.
In the end, I went with a sandisk branded version, had to do a small firmware update and then it worked fine. I think there is only ONE from them, so it shouldn't be too hard to find.