I'm hesitant to add yet another bump to an already year old thread, but the topic of the thread itself is fitting and I feel not a lot of people got a chance to see this because of the competitions that took place the same week of the Buckeye regional.
My vote for best defensive robot this year goes to 1551: The Grapes of Wrath for literally shooting a ball out of the air.
It's about 40 seconds in to this
video that team 291 was so gracious to provide on their Ustream account.
Watch and be amazed.