To threadjack this back to the original post and do a little resurrecting...
Both the FAA and the airlines are starting to come up with some pretty cool pieces of technology to be implemented both on the ground and in the cockpit. The FAA wants to sink $20 billion into something they call "NextGen" over the next 20 years. That's all fine and dandy, and I'm all for any new gadgets that give us, and you pilots, a better view of the picture, but the fact is that both the airlines and the FAA are selling this technology to the public based on the notion that it will decrease delays... and it won't do that. Probably not even a little bit.
What it will do is allow for more efficient routing... less time in the air, less fuel being burnt. But delays don't stem from aircraft having to fly a specific route... the stem from the fact that, not matter how close you can fly two airplanes enrouet, you can still only have one on that big strip of concrete at a time (two at the places where TIPH hasn't been taken away) and you still have minimum seperation for wake turbulence - something that neither a radar or GPS based system can prevent. Furthermore, as long as the airlines insist on using hub scheduling and plan schedules around VFR arrival rates then you're going to be backing the system up faster than you can say "airmass thunderstorm."
I'm all for ADS-B. A well-informed pilot is a helpful pilot. But if you want to reduce delays then you either need to build more runways and schedule less flights into airports where delays are an issue.
BTW - Anyone know how to change a username?