I'm looking forward to DS more than NWN at the moment. I'll be getting both, mark my words, but I honestly believe that they are two quite different games. I see DS as being hack done 3d (anyone who doesn't know hack should stop calling themselves a fantasy computer RPGer and walk away now), whereas NWN is pen-and-paper D&D done on a computer.
NWN has already been slipped to Q1 2001, and now so has DS. We'll be seeing NWN either slip more or ship with a patch practically required - this is a *complex* game and very ambitious.
I'd like to see a bit more variety in my RPGs beyond the D&D model, too. NWN will be the last word in orcs-and-goblins stat-driven level-based tactical non-arcadey D&D-style RPGs, but lets not kid ourselves that that is all there is to RPGs. Fallout still ranks as one of my favourite RPGs and it is not D&D or a D&D world even tho it does fit the levels/tactics/non-arcade model. I play Baldurs Gate and Diablo II - they are both cookie-cutter fantasy but one is an action hacker and one isn't.
NWN is a brave step forward with allowing players to DM games over the net. If NWN is profitable we will see more of this kind of thing in future. If it isn't (even if it is fantastic) then we won't.
Saying NWN is the last word in RPGs and everyone else may as well give up would be like saying half-life is the last word in FPS games, so may as well not make games like Deus Ex, Thief2 or Unreal Tournament.
Dungeon Siege and NWN will be two very different games, and in all probability both succeed for very different reasons.
Oh, and Throne of Darkness looks ever so cool.