Some more:
Grants Feat
Improved Sunder (Breaking Blade, 18,310gp, AEG-103) +2 halberd; does double damage against simple and martial reach weapons
Ambidexterity (a 3.0-only feat) and Two-Weapon Fighting (Rod of Seven Parts, artifact, AEG-154) only when wielding 6 or 7 parts of the rod
Grants benefit of:
Deflect Arrows (Arrowdeath Flail, 33,690gp, AEG-99) +2/+1 dire flail; weilder can deflect projectiles and thrown weapons as if she had the Deflect Arrows feat; when taking total defense action, grants an additional +2 deflection AC to ranged weapon attacks only
Two-Weapon Fighting (Rod of Flailing, 50,000gp, DMG-235) +3 dire flail; 1/day get +4 deflection AC and +4 resistance saves for 10 minutes
Augment Summoning (Deep Hollow Circle, 50,000gp, Races of Stone-168) dwarf or gnome only (or UMD DC25 to emulate race); also summons additional Earth sub-type creature
Quicken Spell (Dwarfheim Circle, 50,000gp, Races of Stone-168) dwarf only (or UMD DC25 to emulate race); works on spontaneous spells as well; also works on spell-like abilities
Maximize Spell (Healing Circle, 50,000gp, Races of Stone-169) Conjuration (healing) spells only
Duplicate Feats:
Improved Crit - Impact (MIC-37) +1 weapon bonus, doubles threat range on bludgeoning weapon (ie Keen for bludgeon)
Empowered Spellshard (MIC-96); acts like Empower Spell on a specific spell; 3x/day; cost: 1500gp (1st level spell), 3000gp (2nd level spell), 6000gp (3rd level spell)
Deflect Arrow (Buckler, Beetle, AEG-14) Beetle blocks ranged attacks as the Deflect Arrows feat, but uses the beetle's reflex save(+6) not your own; must be worn for a day before it works.
Improved Disarm (Disarmor Armor, 10,875gp, AEG-94) 3/day, when opponent scores a melee hit, wearer can attempt a disarm with a +5 bonus; +2 scale mail (subtract cost of +2 scale mail (4,200gp), and 3/dy improved disarm costs 6,675gp)