to my knowledge there are the 2 proven different (incompatible) T.radix albinos:
1)iowa
2)nebraska
also Steve had a wild caught with orange and my wild caught this year both not yet tested for compatibilty to detirmine if different gene that the current well established strains. Also Scott said someone found another in Nebraska recently

There is also the T.sirtalis sirtalis, currently 4 albinos that I am aware of
1)Shuett
2)Bluegrass
the Sheutt and bluegrass have been proven to not be compatible
3)Florida albino
4)Midwest albino
The New York paradox albino has yet to be reproduced
The last two (florida and midwest) have not been tested for compatibilty with the others to my knowledge.
There have been others before, the New York paradox albino has yet to be reproduced and others have come and gone

There is also the 2 red-sided albino strains T. sirtalis parietalis
1) the kansas strain
2) the Iowa strain
Not sure but I don't think they have been tested for compatibility either.

There is also the albino checkered. T. marcianus

There may be more out there that I am unaware of, and certainly some other have been found but didn't make their way into the hobby market.

If I'm missing any someone please chime in