Starkiller
Super Freak
Congrats on the harddrive and saving space! I'm always a proponent of getting rid of stuff. To answer your question, yes, the scenes in TPM have been altered with a CG Yoda, but not in a full release. The altered scenes can be seen as part of a behind-the-scenes doc on the bonus disc for ROTS.
Ahhh yea, I knew I saw it somewhere. So it has been done...just not implemented yet in the actual TPM dvd. But the blu-rays are in the works, who knows maybe 3D blu-rays of all 6 films. I think by 2012 we will have them.
And yes digital is the way to go now, more people need to adapt I haven't bought a DVD or blu-ray in years. And only the 6 Star Wars films on blu-ray will get me to break that trend.