Please correct me if I'm wrong

But on my AMD, by using "-force64", I can still boot into the GUI in 64-bit mode

All installed kexts (both 32 & 64-bits) were running fine,
including the sleepenabler.kext

I'm also still able to run all applications which were built using 64-bit compiler
such as: Mac's Finder, Safari, TextEdit, QuickTime, Colloquy, etc

Even the 64-bit GeekBench (www.primatelabs.ca/geekbench) gave me a better/higher score than I got in the 32-bit mode

The ONLY problem was ONLY all 32-bit apps refused to start in 64-bit mode & quit unexpectedly,
with the same repetitive errors: "Exception Type: EXC_BAD_INSTRUCTION (SIGILL)"

-force64 means you can run 64bit apps but retain all your 32bit kexts. It's just like snow leopard in 32bit mode with a 64bit Intel Core cpu.

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GA-Z68XP-UD3: Lion 10.7.3, Windows 7 Professional 64bit SP1 and FreeBSD 9-RELEASE, Core i5 2500K @ 3.3GHz, 16GB 1333 Mhz DDR3 ram(Soon), 1GB GDDR5 Nvidia Geforce GTX 560 Ti, 2X 1TB Samsung F3 SATA HDDs, 1X WDC Blue 500GB HDD; Dell Mini 10v: Obsidian Black, 2GB DDR2 533MHz Ram, 1.6GHz Intel Atom N270, 120GB HDD, 6-Cell, Mac OS X Snow Leopard 10.6.8 Build 10K549

I think need to explain this kernel,
1. if you want to boot with 64bit kernel, AMD cpu need add arch=x86_64 into com.apple.Boot.plist. but your AMD CPU must support SSE3, if not, you only can boot with 32 bit kernel(and can't using -force64)!
2. the -force64 is 64 bit mode enbler! this support runing 64 bit app,
but this kernel still not add on-the-fly opnode, so if you boot with arch=x86_64 or -force64, you system only runing 64bit app, you can't runing 32 bit app, it will crack!
3. if you using arch=x86_64 can't into gui, you must confirm you graphics driver, can't into gui isn't this kernel problem!
4. this kernel has been testing on some AMD system, it can boot with 64bit kernel(not -force64, using arch=x86_64)!

Pcj

As you can see from my photo, an obstacle with using this, is that there is no properly working 64-Bit capable Chipset driver for the two most common ones on AMD based setups (AMD/ATI & nForce) - so you should check if the one of the mainboard your're going to use, can run SATA devices in AHCI mode...

Though it doesn't work flawless with all apps, I would love to see an screenshot showing 64-Bit Kernel been booted hundret percent succesfully on AMD....

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Did the development of this kernel stop? Because it is the only kernel that works right for me on my AMD x2, all the other legacy kernel's are buggy on my AMD X2 and it makes me quite annoyed.

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GA-Z68XP-UD3: Lion 10.7.3, Windows 7 Professional 64bit SP1 and FreeBSD 9-RELEASE, Core i5 2500K @ 3.3GHz, 16GB 1333 Mhz DDR3 ram(Soon), 1GB GDDR5 Nvidia Geforce GTX 560 Ti, 2X 1TB Samsung F3 SATA HDDs, 1X WDC Blue 500GB HDD; Dell Mini 10v: Obsidian Black, 2GB DDR2 533MHz Ram, 1.6GHz Intel Atom N270, 120GB HDD, 6-Cell, Mac OS X Snow Leopard 10.6.8 Build 10K549

scififan68 I pm pcj and he send me the link for new version of kernel
You can download it from here
http://u.115.com/file/f9e07137e

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10.6.2 Pcj 64-bit kernel | Mobo Asus P5LD2-VM Revision 1.03 945G/ICH7 Graphic Intel GMA950 | CPU Pentium 4 630 3 GHz HT
Sleep never wake up, Quicktime 64-bit crashed

10.6.2 Vanilla | Mobo GigaByte GA-EP43T-UD3L | CPU C2D E7500 | GPU GigaByte GV-N240D3-1GI Nvidia GT240 ( Full QE/CI )

Thanks, NghiaDev, for the link and i want to thank pcj for such a great kernel! And here's another mirror for v1.1: http://www.mediafire.com/?y3jj2ht2wfn use the older version, I get random kernel panics on both my amd x2 and pentium 4. Also look here. the Applenforceata patched to work in 64bit mode, proof

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GA-Z68XP-UD3: Lion 10.7.3, Windows 7 Professional 64bit SP1 and FreeBSD 9-RELEASE, Core i5 2500K @ 3.3GHz, 16GB 1333 Mhz DDR3 ram(Soon), 1GB GDDR5 Nvidia Geforce GTX 560 Ti, 2X 1TB Samsung F3 SATA HDDs, 1X WDC Blue 500GB HDD; Dell Mini 10v: Obsidian Black, 2GB DDR2 533MHz Ram, 1.6GHz Intel Atom N270, 120GB HDD, 6-Cell, Mac OS X Snow Leopard 10.6.8 Build 10K549