Was there any successful spear mods for Oblivion? I can't recall any.
Well here is some
Animation most hard thing to mod
CCAO - Cotyounoyume Combat Animation Overhaul
http://tesnexus.com/downloads/file.php?id=36261
This awesome mod allow use different custom animation sets for weapons even NPC can use it (fixing Oblivion problem of weapon class animations), include spears animation also.
KSTN Spear Stance 1H
http://tesnexus.com/downloads/file.php?id=27865
This mod allow use Spear&Shield style, completely new custom animation
Unnecessary Violence
http://tesnexus.com/downloads/file.php?id=24936
This great mod have many options and greatly expand combat system feature Throwing Spears, but also allow to thrown any other weapons as well, many parameters included in throwing mechanic its not just an button for throwing but a true skill from RPG.
Spears of Cyrodiil
http://tesnexus.com/downloads/file.php?id=12611
This mod created by autor of Deadly Reflex utilize some vanila staff animations for spear combat
Spear of Bitter Mercy OBSE
http://tesnexus.com/downloads/file.php?id=7733
This mod also do this, but also return ancient TES artifact.
Mesh model for weapon also need, so there mod thats add spear weapons to game without animation mods from above they will work like sword.
Armamentarium Complete 1-35
http://tesnexus.com/downloads/file.php?id=18417
Awesome mod Trollf and Team Arma expand weapon variety greatly, add spears and polearms also
Artifacts 1-1
http://tesnexus.com/downloads/file.php?id=25309
Trollf Corepc TeamArma add even more variation
HelBornesSpearSet10
http://tesnexus.com/downloads/file.php?id=32363
Awesome work of Hel Borne and Loth DeBonneville
Helbornes Chitin Armor and Weapons
http://www.tesnexus.com/downloads/file.php?id=30541
This awesome mod by Hel Borne recreate Chitin armors and weapons from morrowind, include chitin spear.