We've shown the Athlon 64 to have extremely solid single threaded performance. With the exception of our encoding tests, the Athlon 64 really can't be beat when it comes to running a single application.
The tables are turned as soon as multitasking is introduced, where you can't beat the fact that the Pentium D is able to fulfill the needs of more applications running in the background.
http://anandtech.com/cpuchipsets/showdoc.aspx?i=2389&p=1
The new Pentium D, even at 2.8GHz, totally cleans up at multitasking, which is good news for anyone who wants to play a game while burning a DVD or encoding a video.
AMD still rules at single threaded processes, but it just can't keep up with the Intel once you introduce a multiprogram enviroment.
Also, the article leads one to believe the Pentium D will be much cheaper than the Toledo.