Q: What's the advantages of running 64bit? Why do people choose to run it? I've heard that it really only boils down to recognized memory amounts.
It was basically a 16-bit world in the 1980's (through DOS and Windows 3), and it's basically been a 32-bit world since the mid-90's. But we're definitely rushing into a 64-bit future.
1) In general, there's seldom any advantage in installing 64 bit apps. For the most part, just install the 32-bit versions.
2) In general, there's EVERY reason to install the 64-bit version of the OS. Just make sure you also install the 32-bit runtime libraries (along with their 64-bit counterparts).
You'll thank yourself for installing the 64-bit OS the first time you want to try something serious with VMWare, Oracle or JBoss, for example.
'Hope that helps .. PSM