Slizarus,
The Dichotoma "Giant" has a brief winter dormancy.
No idea on the others, except I have a D. nitudula x pulchella, which is an Austrailian pygmy sundew that is easy to grow. Just treat it like any other pygmy, which is to say like a warm-temperate rosetted sundew. In the wild, they have summer dormancies, but don't require one in cultivation. Of course, this is all true if D. nitudula is at all like a D. nitudula x pulchella.
Capslock
PS: I was on vacation and missed the BACPS show, darnit!!!