Last summer the CERN director okayed the demolition of their collider to make room for the much more powerful Large Hadron Collider to be available in 2006. I believe this makes Fermilab the most powerful collider presently in use.
The CERN decision was a tough one. A group there thought they were getting data indicating discovery of the Higgs boson (the God particle) and they just needed a little more time. They were granted a couple of months but it wasn't enough and delay in starting construction was busting the budget, so they had to pull the plug.