(Note: Please cite sources when possible -- a lot of the stuff in the books themselves is already conflicting, so we may want to mark when something's speculation to keep heads from exploding.

Known Dragons:
The Three Chained in Shadow - tBH p. 48-54: Eloth, Mistress of Illusions (Meanas, Mockra and Thyr); Ampelas (Kurald Emurlahn); Kalse (aspect ungiven). Contested for the throne in order to heal Emurlahn, chained and "very nearly killed" by Rake and the Andii.
Silanah - Aspect Thyr, seduced by Rake and persuaded by Olar Ethil to bring fire to the world of the Imass.
Curdle and Telorast - "Thieves," possibly attempted usurpers. Found hovering over two chained Andii bodies in Shadow.
Otataral Dragon - HoC p.564-566ish: Aspect Otataral, found in Imperial Warren in HoC on a wooden, x-shaped cross with hind legs impaled and chains wrapped around neck to make head face the sky. Still alive and sealing a gate -- "not really" in the Imperial Warren, but in a warren unto itself, sealing the enteranceway. Bound by other dragons. Appears to be female.
Sorrit - Aspect Serc; known to Icarium. tBH p.193-194: Her death means that should Osserc fall, Serc will be without a ruler. Crucified on Blackwood, spiked on otataral through the neck and chest. Sorrit was found in a short-tail KCCM refuge underground, one that had been frozen by a Jaghut in her attempts to route them during their civil war, though Icarium believes her to have been killed in Shadow.
Vision Stuff:
Dragon seen in the Dust of Dreams Prologue
The strange two-legged lizard, all clad in black gleaming armour, its tail nothing more than a stub, standing on a stone landing of some sort, whilst rivers of blood flowed down gutters to each side. Its unhuman eyes fixed unblinking on the source of all that blood – a dragon, nailed to a latticework of enormous wooden beams, the spikes rust-hued and dripping with condensation. Suffering roiled down from this creature, a death denied, a life transformed into an eternity of pain. And from the standing lizard, cold satisfaction rose in a cruel penumbra.
Casting of the Dragon Hold
"The Hold of the Dragon. Eleint Tiam purake setoram n'brael buras ("Children of the mother Tiam lost in all that they surrendered") . . . The Eleint would destroy all in their paths to achieve vengeance. As we all shall see in the long night to come. The Queen lies dead and may never again rise. The Consort writhes upon a tree and whispers with madness of the time of his release. The Liege is lost, dragging chains in a world where to walk is to endure, where to halt is to be devoured. The Knight strides his own doomed path, soon to cross blades with his own vengeance. Gate rages with wild fire. Wyval -- Locqui Wyval waits. The Lady and the Sister dance round each other, each on her own side of the world. Blood-drinker waits as well, waits to be found. Path-Shaper knows fever in his blood and staggers on the edge of the precipice." --Midnight Tides, p.207-208
Random Lists:
Ye Old Pureblood List
T'iam, Kalse, Silannah, Ampelas, Okaros, Karosis, Sorrit, Atrahal, Eloth, Anthras, Kessobahn, Alkend, Karatallid, Korbas, Olar
Known First-Generation Soletaken/Mixed Blood
Osserc, Scabandari, Anomandaris, Olar Ethil, Draconus, Silchas Ruin, K'rul
Inherited/Uncertain Provenance Draconic Soletaken (corrections and additions welcome)
Sheltatha Lore, Sukul Ankhadu, Menandore, Spite and Envy, Tulas Shorn, Rud Elalle, Korlat, Orfantal, Nimander (?)
Sealers of Starvald Demlain
Draconus, K’rul, Anomandaris, Osserc, Silchas Ruin, Scabandari, Sheltatha Lore, Sukul Ankhadu, and Menandore
Choice quotes regarding Sorrit, taken from tBH p.193-194:
"She was bound by otataral. Yet, she was Elder -- she should have been able to defeat that eager entropy. . . ."
"Old and new." -- Mappo and Icarium
"Who first dipped their hands into this fell stream? Who drank deep and so was transformed, and what effect did that otataral spike have upon that transformation?" -- Mappo
"The K'Chain Che'Malle did not kill Sorrit. They knew nothing of it. . . . I am certain of it. . . . The crucifix, it is Blackwood. From the realm of the Tiste Edur. From the Shadow Realm, Mappo. In that realm, as you know, things can be in two places at once, or begin in one yet find itself eventually manifesting in another. Shadow wanders, and respects no borders."
"Ah, then...this...was trapped here, drawn from Shadow --"
"Snared by the Jaghut's ice magic -- yet the spilled blood, and perhaps otataral, proved to fierce for Omtose Phellack, thus shattering the Jaghut's enchantment."
"Sorrit was murdered in the Shadow Realm." -- Icarium and Mappo
I Can't Think of Any More Categories:
- There was a Shadow Forest predating the First Empire; dragons fought there, "presumably the same dragons that are now imprisoned within the stone circle" (tBH p.173)
- Dragon's blood can slide through warrens until it reaches its warren of aspect and presents an inescapable trap to wraiths (RG)
- When Cotillion notes Eloth and Silanah both claim Thyr and that it was clever of K'rul to make her share power, Ampelas points out that "unlike Tiam, when we're killed we stay dead" so there is some redundancy in aspects as a sort of failsafe. (tBH p.53),
- Scabandari spilled draconean blood in the heart of Emurlahn, though whose is not specified. (tBH p52)
- The KCCM are known as the firstborn of dragons (RG) and as of the DoD prologue we see one of the last enclaves lives in a place called Ampelas Rooted.
- Murdering the dragon embodying the aspect can weaken the warren, as per Icarium and Mappo's conversation about Sorrit in tBH, and is one way of undermining the pantheon.
- SPECULATION: Dragons, being Elder, are resistant to otataral alone (a newer manifestation, it seems), and so to really kill them you need to throw in an older element -- the Blackwood, which grows native to KE and can pass through realms -- thus Icarium's comment "Old and new." And if that wasn't enough, Mappo seems to believe someone drank from Sorrit's blood, too . . .
That's it for now because my frontal lobe is crying.
Also, a personal request: If anyone sees any passages about Tiam, could you snag them? Her precise history is unclear, specifically whether or not it was Rake who killed her for the final time -- I doubt actual quotes will turn up the truth, but at least we can go on with our wild mass guessing from a stable platform.