Go to http://www.anandtech.com and read the AMD road map info. Even though they more or less said that they would support the 754 socket for a while, it is obvious that they won't.
Look at the new 90 NM CPU's for the socket 939 mobo's. Great price and performance and much better thermal performance.
I'm looking to upgrade my processor and m/board and the Athlon 64 is looking favorite but I don't want to change the 2x512mb PC2700 ram or Seagate IDE HDD I have on my current XP 2000+ set up, is there any advatange for me to spend the extra $ on a 939 pin version or would I be better off with a 754?