Christoph the Magus
Explorer
I was too lazy to read the other replies, so apologies if this repeats things. For my group, the question isn't what did we keep from 3.0, it's what did we add from 3.5. Only about half of us bought the revision, and we were all pretty happy with 3.0 as it was. We added a few things (like some of the new spell durations) but we're playing a 3.0 game for the most part.