Brit...I absolutely LOVE that video of Jackson! Infact, I've even played it for my daughter when she was home from college and she loves it too. She downloaded the background song you used to her ipod and she saved it as the "Jackson song"
Being raised with yorkies, my experience has always been that they are a very intelligent dog. ZoE was extremely quick to train and its easy to teach her new tricks. You can tell she really likes the stimulation of learning new things.