No, it's I that thank you...knowledge is empty unless shared. Not too many out there with any jazz for taxonomy, so it's a pleasure to help.
Here is the link you requested. I found it by typing "CPN Listserve Archive" in Google, which brought the page up as #1. Selecting this brings you here:
http://www.carnivorousplants.org/cplist....tht=Mar
Use the dictionary link for any unfamiliar words/terminology. There are many terms in botany, and you don't have to go to school to learn them, just go for it! As you use these terms they will become familiar and easy. You don't need a diploma to master a subject you love, just to make $$ from it, lol.
As to what makes a species, and the genetic aspects I fear you have the wrong guy to help there. There are many considerations involving not only genetics but also geographic details of isolation and radiation (i.e. how the plants spread).
Read Dr. Schlauer's comments on the issue of hybrids, and you will get some ideas. Dr. Schlauer is the ultimate academic taxonomist and the elected guru of CP.
The Listserve was a wonderful educational tool back when Dr. S. was active in posting to it. It is an E newsletter delivered @ daily to your email. This was before there were boards like this. You respond via email, and the reply is sent to all listserve members. I found it cumbersome and not conducive to long conversations since the topic disappears if no one copies it and responds to it. In later years, it became dominated by ugly off topic flame wars since there was no one moderating. It was nasty. I quit going there because of some members who disgusted me with their hatefulness. AFAIK Dr. S. rarely posts anymore. I believe it is still up and running, and you can join by sending a message. Websearch it. I warn you, it was never overly friendly to newbies....dominated by the hoity toity eggheads IMO. Most people were afraid to say ANYTHING for fear of a load of poo being dumped. Not fun.
But the days of glory were indeed glorious. I learned so much there. Probably the closest thing there is to CP School, lol.
BIG dews? Vertical or horizontal? Verticle it would probably be D. gigantea, right Sean? The Aussie tuberous species climb and weave through the brush, so I guess they win. More commonly, D. binata would fit the bill. D. filiformis v. tracyi and D. filiformis v. filiformis are very showy.
For rosetted dews, D. venusta, D. slackii, D. aliciae, and again any number of tuberous rosetted plants. D. adelae can get pretty big. D. regia is a monster well grown. Some D. cuneifolia are bigger than your palm. D. capensis is no bitty thing. D. schizandra can get leaves as big as your palm (at least in Queensland). They get huge if well grown.
Big is relative. The biggest pygmy I grew was D. pulchella x D. ericksoniae.
D. capillaris is a very variable species, depending on where they're from. Usually quarter sized on the smaller end to as big around as a Coke can. Some are even upright, like D. intermedia. Neither size or color are of much use in distinguishing Drosera species.