64 bit are good, by Microsoft

Many people have now 64 bit processor, but nearly nobody have system different than 32bit XP windows with SP2. Their new system called Vista, will exist in 32 and 64 bit versions, but its sucessor, (codename Longhorn R2) will be only 64bit, and many product from Microsoft will follow, and wont exist in 32bit versions. That is only situation for home machines, professional servers will be 64 bit only soon.