I thought that Boston would be a cool city to have TechEd in, but alas, it is disappointing. The Convention Center is quite a bit out of the city if you are walking. Taxis are expensive and the city around here seems quite dead. Hotels are expensive and the traffic in the morning is crazy. It took the bus 50 minutes to get 8 miles from the hotel to the convention center.
I've been to around 5 different TechEds and by far the best one I have been to was in Dallas. Dallas is a great city.