Advantages of a 64 bit DAW?

I've been hearing many people complain and get out right mad because brand X doesn't have 64bit drivers. I'm just looking for knowledge as to what a 64bit OS is going to do for me. Are things going to be able to be processed fasted? Obviously more RAM can be implemented, but I'm just curious to understand more in-depth what it will really bring to the table. I'm more than happy with WinXP32, and don't plan on moving anywhere until I have to, maybe more to the fact that I make music for personal reasons and have no motive to trying to "make it". I have a grat set-up for what I do, and built a DAW just shy of a year ago with a core2duo(E6600) 2g of RAM and so on, and this will do more than I will probably ever throw at it. I'm only looking for information here, as I don't know really anything about 64bit OS's, so even feeding my cranium with simple facts about the 64bit world would really help. Please anything and everything will help, as my thirst for this knowledge has been unquenched, and I know many here are either using a 64bit OS or have knowledge of using one. Thanks in advance.