One of my favorite things in Vanilla, and up to WotLK, has been the talent trees. They have really made it possible for people to customize their character accourding to their play style. I love being able to fool around with different combinations, seeing what combinations bring out the most dps, and what combinations have a better feel to them. It really brings out the uniqueness of each player's game style that we don't see in todays retail games, let alone WoW.
The one thing that dissapoints me about talents is that you have to pay so much for each reset, making it impossible for me to really try out all the different combinations that I would like to. This is something that I think should have never costed anything from the start. Paying for ones spells is more understandable, but paying for ones talent resets have always seemed obsurd to me. It just doesn't go with the flow of the game. It takes away from the freedom of play that is so great about WoW. This seems like such a small thing, but I think it really affects the game in a major way. It puts you in a prison in the way you play the game. This is something that if changed, would not effect the economy of the game, because it is such a minimal aspect of where gold goes, but would affect players freedom in a major way.
I think in creating a Vanilla server, you all should be more focused on bringing out the freedom in Vanilla that made it so great, other than copying what they did before. The reason WoW has become so boring is that it has become so structured and robotic. Don't just copy what Blizzard did when they first released WoW, but understand why it was so much better than what it has become today, and improve upon that. Which means more freedom, and less structure.
Please consider changing this, and please think about what I've said about improving the game as you all move forward. It makes a huge difference in the way you look at this project. If you aim to copy what Blizzard did, well, you will copy it, but if you aim to unearth what made Vanilla so great, then you will bring about something more beautiful than before.