The Computer Boy - HowToGeek.comFound a pretty good article over at describing the difference between 32bit and 64bit in regards to Windows7.  The article gives a brief history of 64 bit, some tips about if your computer can handle it and lists benefits and shortcomings of using 64 bit computing.

For those that have always heard the term “64 bit” but never really knew what it was you may want to check this out.