My copyreserved... There is no such word for "pre-order" in German, how refreshing

A couple of other alternative methods of booting Snow Leopard into 64-bit have been found :

http://blogs.zdnet.com/Apple/?p=4734&tag=nl.e539

Either change the Kernel plist file or change the parameters in nv-ram (non-volatile RAM)

El Reg's Snow Leopard first look
http://www.theregister.co.uk/2009/08/25 ... w_leopard/

There's an app for that.
Or you can just hold down the '6+4' or '3+2' keys on boot, allegedly.
As I said, you probably don't actually need or indeed want to boot into 64-bit kernel mode anyway. Unless you're sure all the kext's are 64 bit, it's going to break things for no obvious gain. I suspect VMware, Parallels and EyeTV won't run on a 64 bit kernel until they get patched for example.

Basically I'd say unless you know you have to boot the 64 bit kernel and why, you probably don't.

Jon