Grabbing opponents weapon

[Legildur]

As for moving an opponent's sheild out of the way, I seem to remember an old feat in Sword and Fist called Pin Shield, it required you to be TWFing though.

Revised in Complete Warrior - requires TWF and BAB +4. Use full attack action while wielding two weapons - sacrifice off-hand attacks to negate opponent's shield bonus to armor class until the end of your action.

 

[Saeviomagy]

Revised in Complete Warrior - requires TWF and BAB +4. Use full attack action while wielding two weapons - sacrifice off-hand attacks to negate opponent's shield bonus to armor class until the end of your action.

And of course you can be twfing with a bare fist, or a shield, or whatever. They're all listed as weapons.

 

[Darklone]

There's a combat manoever called Shield Disarm in the Kalamar Players Guide as well.