1. Yes, Yes

2. You can use some, files will stay (if on a different partition) Install all apps to ensure full support.

3. You can delete 10.5 if it DOESN'T have the bootloader (install on the 10.6)

4. DSDT is need to get all cores working. In all likeliness, you wont need it if it works without it on 10.5. I think CORE i7 needs it like mine.

5. NO! Use the Snow leopard 32/64 bit kexts.

6. EFI strings! They work best and there is no 64 bit injectors yet! EFI strings are easy with EFI studio.

7. Try it, no harm done. Distro? Not an official one yet. Don't worry, it was the first time I installed OSX without a distro. Took two days but got it all working!

Any more questions?

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OS: Snow Leopard Mac OS X 10.6.2 (10C540) | Vanilla Kernel | 64 bit Kernel | EFI64

CPU: Intel Core i7 920 @ 3.6 GHz
GPU: 2x SLI Dual GTX 260 (OpenCL working)(QE+CI)
RAM: 6GB DDR3 1600MHz 7-7-7-20

AUDIO: Realtek (5.1 config)
HDD: RAID 0- 1 + 1TB HDD's | 320GB HDD
MOBO: MSI X58 Platinum SLI (Intel ICH10)

CASE: Haf 932 Full Tower Case + Red Cathodes
MONITOR: Asus VK266H 26" 1920x1200 LCD

All working