[Punisher454]

For general apps 32 bit vs 64 bit wont really make any difference. But for some things is it significant. 64 bit allows the program to access much more memory and work with much larger numbers in 64 bit. For example in the game engine I work with, they have both a 32 bit and 64 bit versions of the editor. The 32 bit version is limited to working with much smaller maps due to the fact that it cannot address the larger world space.

But its true that on most things you wont see a difference. Not all apps need 64 bit power, and many that could benefit from it are not programmed in such a way as to take advantage of the extra power.