What's the difference between running apps in 64bit vs 32bit?

Just curious...  I know there are numerous advantages to running in 64bit mode but I'm curious as to what they are...  Right now I run pretty much everything in 32bit mode...  And with the new OS coming out I was wondering what the advantages were?  Some of my Apps still aren't even ready to run in 64 bit mode w/ OS X Lion.
Thanks!

You can take advantage oven more RAM if your MP model can boot the 64-bit kernel. Have you seen:
Mac OS X- 64-bit kernel frequently asked questions
OS X v10.6- Macs that use the 64-bit kernel
OS X v10.6- Starting up with the 32-bit or 64-bit kernel
32- or 64-bit Kernel Startup Mode Selector 1.6

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