Tomorrowland was one of the original lands at Disneyland in California when the park opened in 1955. Walt Disney intended it to be a place where visitors could experience a fun and exciting look at what the future might hold for humankind. Unfortunately, it's proven to be nearly impossible to keep Tomorrowland on the cutting edge of tomorrow, for both practical and logistical reasons. Tokyo Disneyland's Tomorrowland has also suffered from this fate, and its theme has shifted away from a realism-based vision of the future to science-fiction fantasy and Disney movies.
Although Tomorrowland isn't quite the land of tomorrow, it does hold some of Tokyo Disneyland's biggest attractions including Star Tours and Space Mountain. It's also the home of Showbase, which features some of the park's most popular live-action shows. My favorite place in Tomorrowland is not an attraction though, it's a restaurant: the Pan Galactic Pizza Port.
Aesthetically, Tomorrowland is nothing to get excited about. The atmosphere is pretty ordinary, certainly nothing like you'll find in Adventureland or Toontown. There are no people-movers or monorails whizzing by overhead (even the Skyway has been closed down now), and it just does not have the feel of a fast-moving world of tomorrow.