I love the idea of sunder, but it's execution leaves a lot to be desired. Especially when the most valuable treasure you get from defeating enemies is their weapons. So I wrote a PDF to broaden my vision of what the sunder ability should be able to do.
My sig has a link to Sunder Feats, a PDF that makes sunder both more versatile and lots more fun to use.
For example, you can sunder an arrow as it flies at you and then deflect the shrapnel into nearby opponents to deal damage to them.
Arrow Slash
You can sunder a projectile in the air.
Prerequisites: Str 13, Power Attack, Improved Sunder
Benefit: You may use a slashing weapon to attempt to sunder a projectile that would hit you. You gain a +4 on the attack roll and deal double damage to the projectile if you hit. If you do not sunder the projectile you take damage as normal. You do not provoke an attack of opportunity when attempting to sunder the projectile. You may only attempt to sunder one projectile per attack of opportunity.
Shrapnel Sunder
You can turn a sundered object into a deadly strike.
Prerequisites: Str 13, Power Attack, Improved Sunder.
Benefit: If you successfully sunder an object carried by an opponent (such as a weapon or shield), you may deflect the shrapnel to hit an opponent adjacent to you. The opponent you choose must make a reflex save DC (10 + 1/2 character?s level + dex bonus) or suffer 1d6 points of slashing damage. You may make one shrapnel sunder per attack of opportunity.
I also made it more appealing for characters with Sneak Attack to use the Sunder Feat.