64bit technology isn't that new, and 32bit stuff can still be used on 64bit processors (I have 32bit Windows on my 64bit machine). 64bit processors aren't two processors in one (unless they are a dual core). Yes, Vista will have a 64 bit edition (or editions, according to the latest news).

Here's some more information on 64bit processors. (http://en.wikipedia.org/wiki/64-bit).

enmand