Monkey Grip( Sword and Fist: A Guidebook to Monks and Fighters, p. 7)
You use a wider variety of sizes of weapons.
Base attack bonus +3, Str 13+, Weapon Focus with the appropriate weapon,
You can use one melee weapon that is one size larger than you in one hand. For example, a halfling with the Monkey Grip feat can use a longsword in one hand. You suffer a -2 penalty on your attack roll when using this feat. This feat can be taken multiple times, each time with a different weapon.
Only weapons of your size or smaller can normally be wielded with one land.