Hi. I registered on this forum just to reply on this topic.

I've got Lion 10.7.2 running on AMD. 32-bit only though...
I installed it to another partition from my Snow Leopard, replaced the kernel, added kexts and replaced the Finder.app with the one from DP2.

My boot flags: -legacy arch=i386 npci=0x3000
I use Bronzovka's kernel V4. The system hasn't crashed even single time in few days.
Only problem I've found is with Logic Pro 9, it crashes for some unknown reason...

But now I'm interested in 64-bit. I have Phenom II 965. I've read few pages of this topic and it seems to be pretty damn hard to get the kernel running in 64. So, what blocks the 64 bit? Is the kernel compiled only for 32/i386?