I came across the following article about Vista 64 Bit. The Source ( HERE ) has also some interesting answers from Vista 64 Bit Users which may give a good overview of the real using of the OS which everyone should read.

Windows Vista 64-bit Today

There appears to be a shift taking place in the PC industry: the move from 32-bit to 64-bit PCs. We've been tracking the change by looking at the percentage of 64-bit PCs connecting to Windows Update, and have seen a dramatic increase in recent months.

The installed base of 64-bit Windows Vista PCs, as a percentage of all Windows Vista systems, has more than tripled in the U.S. in the last three months, while worldwide adoption has more than doubled during the same period. Another view shows that 20% of new Windows Vista PCs in the U.S. connecting to Windows Update in June were 64-bit PCs, up from just 3% in March. Put more simply, usage of 64-bit Windows Vista is growing much more rapidly than 32-bit. Based on current trends, this growth will accelerate as the retail channel shifts to supplying a rapidly increasing assortment of 64-bit desktops and laptops.

64-bit PCs running 64-bit editions of Windows Vista typically have 4GB of memory or more. Compared to 32-bit systems, which top out at around 3GB of memory, 64-bit PCs can offer added responsiveness when running a lot of applications at the same time and have the potential for greater performance and new experiences as next-generations applications are written to take advantage of this new platform.

What started out as a gradual (some would say "glacial") movement toward 64-bit PCs, driven primarily by technology enthusiasts, seems to have turned into a swift transition, likely fueled by the falling cost of memory and consumers' desire to get the most out of their PCs.

This change begs a few questions:

Is the 64 bit market ready to go mainstream?

Will consumers realize the benefits from larger chips and 4GB or more of memory?

The answer to both of these questions is yes - but a qualified yes.

Read the full article HERE

I have used 64 bit Vista on mi desktop for a year and half, it's good and doesn't crash often. What it still lacks is drivers and programs for some peripherials like digital cameras for example.

But it's going to ge increasingly popular and soon. I bought a new laptop couple of months ago and when I switched it on for the first time the first decision I had to make was if I wanted to insall a 32 bit or 64 bit version of Vista. I believe most people will answer "64" to that question as it is a bigger number, surely. And in time we'll have more 64 bit support from popular programs too.