2. Passionate and respectful disagreement. Ebert didn't always agree with his fellow critics, Siskel in particular, but they were able to disagree passionately and respectfully. Okay, mostly respectfully.
3. To echo what others have said, there was also the understanding that entertainment could be well, just entertaining. A movie that was just fun to watch was just as important as one that ripped your heart out.
4. An amazing energy. I confess thinking of working 46 years as a newspaper critic, and also having television shows, and running a film festival, and blogging, and tweeting, and writing books, well I am amazed. And a little exhausted.
5. I've told folks that I think some of the best life advice I can give it to find a way to make plans, move towards your goals and yet be open to the opportunities that show up. So, Ebert's story of working through high school and college with plans to become a features writer, and then being offered the job of film critic and saying yes is a great example of that.
6. Embracing new technologies. This man not only had a twitter account, but appreciated how the medium worked. To say nothing of his website, or blog, or all the other things and gadgets.