OK so Vista is readily available. Any PC a consumer sees at this point out is gonna have it. Question is, which flavor do you want? (or need...!)
Here is a piece from a favorite site that does a nice job of laying it out. Something tells that a certain podcast from someone we all know (!)@(#*$%*$(#$) may be talking about this very topic.
Here she is: Understanding the Vista Product Editions
(Paul Thurrutt's SuperSite for Windows writeup)
Have at it and have fun. So far so good from my perspective. Very smooth ride even with some of my favorite open-source tools loaded as well... Complete listing to follow... as soon as I have a minute...
:-) "No harm, no foul" SDA