Min/Max Boards

What are methods of strengthening or customizing a character in D&D 3.5 that can be applied to almost any character? I've compiled my own list, what would you add, and where is it from?
List of player character improvers:

Attributes:
Skill tricks (CS)
Flaws for extra feats (UA)
Traits (UA)
Racial substitution levels (varies)

Builds:
Alternate class features (varies)
Multiclassing (physical builds this is a must, varies)
Tome of battle, everyone increases initiator level as character level increases, opening access to feats and maneuvers
Prestige classes (magic users this is a must)
Domain feats (must be character relevant)
Skill Synergy bonuses (PHB)
Retraining feats/skills/levels/spells (PHB II)
Item Familiars (UA)
Elder evil worship grants free feats (Elder Evils)
Legendary sites, typically last a year or permanent, esp Otyugh hole for Iron Will, gp valued. (CS)

Mundane Items:
Poisons (varies)
Alchemical items (varies)
Masterwork skill items (generic +2)
Gimmick items (marbles, caltrops, etc)
Exotic weapons (characters can still use, but non-proficiency is -4)
Hidden blades/spaces (sneaky characters, CS)
Alternate materials for armor/weapons (varies)
Armor/Weapon templates (varies, many in DMGII)

Magic Items:
Stack magic abilities on same item, especially +2 4 6 stat bonuses no charge (MIC)
Custom magic items DMG (ask DM first)

Other:
Contacts (DMG II)
Teamwork benefits (PHB II)
Joining a faction (Complete Scoundrel)