There is currently a few different flavours of 'white' cards going around at the moment:
1) "Gamma" cards - these were brought in around sept 2007 when a certain group released public keys for a* which got killed off within 24 hrs. If you were to google Gamma cards, I'm sure you could find the specs. These are still popular overseas, but pretty much useless here in Australia.
2) "White" cards - more a slang term I guess for cards that are white in appearance that you can buy off a seller. These come preprogrammed for specific providers. Little is known as to what sort of card it actually is, all that is known is the fact that they work, and give you pictures depending on which provider you're after.
I have even heard of places like Jaycar selling 'white' cards' which are eithier titanium or gold cards, but these are just white in colour - certainly not gamma cards.
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