What major mods would you recommend devs to have an eye on for Skyrim?
This is not just about adding or tweaking features, it about how mods have done it.
Remember, the new level scaling system in Skyrim may appease your need for a mod this time and higher-res textures won't generally be as imperative for some time after release too and there will be many differences with Oblivion when the game is finished, so be sure to make some smart picks, but if it urges you, you're free to choose.
Let's hear your list.