The portals to capitol cities in Shattrath and Dalaran will be disappearing in Cataclysm, which is a bummer. Back in vanilla WoW, for the month I played before BC came out, I HATED waiting around for boats or zeppelins to arrive, then waiting on board for the vehicle to start again, and finally arrive at their destination. As soon as I heard that I could set my hearth to Shattrath, I happily paid 5-10 gold apiece for all my toons to go there, just so I could quickly continent-hop at my convenience.
When WOTLK came out, it was even better! No longer did I have to run down from the Scryers tier to the portals, they were just around the corner from the inns.
I understand that it's an attempt to try to get more players to stay around the capitol cities, where they will be more likely to be available as crafters, teleporters, or general advice givers to new players. I just don't like it very much.
I'd like to see a continuation of the portal concept. What about being able to access a portal in capitol cities that allowed you to instantly warp to any inn that you had been to? Same concept as talking to flight masters, but due to the higher cost of magic or gnomish engineering mats, the cost would be greater than flying there. That way, new players could still get around at a decent rate, but richer, more experienced players didn't have to deal with a 10-15 minute flight to get to where they needed to turn in a quest.