Well it's just typical isn't it, the day I buy a Supercard a brand new version is released. It takes mini SD cards (which is what I already have) and is the same size as a standard GBA cartridge. The amount the normal Supercard sticks out doesn't bother me too much but it's the fact that this new version would go very nicely with a DS Litle that bugs me. Anyway, details here:
P.S. Just for the record, the standard Supercard comes HIGHLY recommended.