What are they and what are the differences?
EDIT: im sorry i mean for example Vista 32 and 64 bit?

Better Resolution

64-bit will be the next level, as was 32-bit after 16-bit. Mostly, when software is designed to take full advantage of the technology, things go smoother and faster.
I run both OS on my PC (dual boot) and I notice a difference with 64-bit, but I only boot to it when I use Adobe Photoshop Lightroom beta 2 64-bit version.
I tried to configure iTunes on both platforms, as Apple developed a 64-bit version, but gave up trying to sync all the settings.

Once again this is something i covered in my post. Its all about addressing. The differences are in the amount of addresses the system works with. This allows it to handle numbers differently. And computers are all about numbers. It allows it to handle more complex programming. It also allows for more physical memory to be addressed. But there are still problems with some programs on 64-Bit OS's

32-bit Vista can't recognize more than around 3 GB of RAM.

Actually all versions of XP and Vista can recognize at least 4gigs of ram. What most people dont account for is that your graphics memory counts in that number. ANY physical memory or ram counts towards that max number.

I have a 64 bit of Windows Vista so I got a 64 bit processor. So like Hanahou said it is just taking advantage of the technology.

Better Resolution

Hahahahahahahahahahahahahahahahahahahahahahahaha.. .

THAT was funny!!!

32-bit : http://en.wikipedia.org/wiki/32_bit

64-bit : http://en.wikipedia.org/wiki/64_bit

Or, perform a google search.
What could've been answered in two seconds is now a thread :p.

32-bit : http://en.wikipedia.org/wiki/32_bit

64-bit : http://en.wikipedia.org/wiki/64_bit

Or, perform a google search.
What could've been answered in two seconds is now a thread :p.

if that was the case 90% of the threads on this forum wouldnt be here

if that was the case 90% of the threads on this forum wouldnt be here

And that is 100% true. They shouldn't be.