Forcing Snow Leopard to Use 64bit Kernel

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How to force Snow Leopard to boot the 64 bit kernel, cause we all want to run the latest 64 bit goodness from Apple.

Open the file

/Library/Preferences/SystemConfiguration/com.apple.Boot.plist

with something like TextEdit and add arch=x86_64 to the Kernel Flags string:

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<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string>arch=x86_64</string>

This is posted just about everywhere, and is really only added here for my convenience.