with a slashing or bludgeoning weapon
[/spoiler]
These changes have been made because 1) you can totally sunder something with a lance, 2) HEY GUYS LET'S MAKE IT EVEN MORE ANNOYING TO USE THESE COMBAT MANEUVERS, 3) this reads like something that should have been taken out of the final draft--why can't you sunder some other dude's armor, and why would you want to sunder your own?
So, feel free to tear these ideas to shreds, discuss them some more, put new ones up for debate, whatever.
[spoiler]Edit: Specified when a sundered natural whatever can be used again. It has to be healed back to full because otherwise a Cure Minor Wounds invalidates whatever you just did, though in-combat healing will almost assuredly bring the natural whatever back anyway.
Edit again: Redid the broken item text so it made more sense and lessened the chance that monsters would sunder every piece of loot the PCs owned.
And again: Added the option to sunder Force effects.[/spoiler]