Alternatives to Dell's mirrored SD card module for booting a small OS from flash?
There is this: http://www.idotpc.com/thestore/pc/viewPrd.asp?idproduct=918
It only supports one SD card, but many motherboards have built-in RAID 1 support.
I've had some experience with flash drives and ESXi, and mirroring is definitely to be recommended.
Well I can see that thread is almost 4 years old but ...
Check this http://www8.hp.com/cz/cs/products/flash-media/product-detail.html?oid=6339687
and this http://h20566.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=4030997&docId=emr_na-c04630357&docLocale=en_US