OK, so at the end of ROTS, Yoda talks to Obi-wan about the whole Qui-gon has found a way to live in the Force after he died. This was left totaly up in the air, which is weird. Though if i read what i saw yesterday right, there is a slight mention of it before hand. Watch AOTC. Now i think this is at the park right after Anakin tells Padme about killing the sand people, but i may have it wrong, since we were watching this at work and i was in and out. If you have the subtitles off, all you hear is someone screaming "No, Anakin!". We had the subtitles on for once, and I am fairly sure it said Qui-gon's voice. So if someone wants to check that for me that would be cool, but hopefully this shows that Lucas didnt just throw in that as an afterthought.