It appears that 2005 will be the Year of Dual-Core CPUs
It sounds and looks like both Intel and AMD will be shipping dual core CPUs this year.
http://www.infoworld.com/article/05/02/23/HNdualcoreathlon_1.html
While dual cores will not make things run twice as fast, it will be a nice new feature to have. I am sure that we will see some interesting bugs from products that were designed and tested on single processor systems.