by the end of 2006 there maybe a reasonably stable O/S for 64 bit although it will probably be a little longer judging by past windows releases.
By the end of 2006, what machines will be around. Think back to what you had 12 months ago, then 2 years ago. By the time 64-bit windows is stable your 64bit machine will look like the machine you had 2 years ago. Not too pretty is it.
This has been one of the arguments against the AMD64, your paying for something that isn't being used, and when it does have the chance to shine, newer machines will still make it look average at best.
Still going to put one together after that.