After reading this thread, one trend I can see where 64bit is necessary for client side workstations in the next few years is voice enabled applications. Sure, right now they are available - but I can see another "revolution" with these applications and
having their capabilities work as well as the Microsoft handwriting recognition right out of the box.
I would love to be able to start up my computer - or leave it on at all times and just walk into my office and say to my machine, "Computer, start word" and begin to efficiently dictate and when I want to add media to my documents, I can describe what to do
- for example:
"computer add picture from folder My Documents Meeting from last tuesday"
Or "Computer, please add a picture showing a red BMW and fit into frame"
These kind of productivity enhancements require immense processing and memory - 64bit is going to help quite a bit indeed.