The biggest problem whilst traveling for me is not flight info. That's not a problem I have, really. I buy a flight once and forget about it. But I spend a lot of time worrying about not getting ripped off, or walking around finding a safe place to sleep, choosing decent restaurants, selecting authentic places to see and things to do. Wikitravel did an OK job but again it was 'narrow' and also infrequently updated.
In summation, the perfect travel site for me would be basically a map telling me local places to sleep/eat/activity and the price and quality and rating.