Writing a Snow Leopard install guide right now. I decided to try out Windows 7 but it's just not right...so I'm writing as I go along. This guide will install the 32-bit, regular ole' mainstream retail Snow Leopard.
You'll need to have 2 hard drives (or 2 partitions, but I haven't messed with that), an exiswting copy of Leopard installed, and obviously a Snow Leo DVD (retail!).
Basically so far...install 10.5 on another HD, one that you won't need anymore (not where you'll install Snow). Format the Snow drive to HFS+, GUID. It has to be GUID.
Boot into 10.5, pop in 10.6 DVD. You can't install from a mounted image file.
In Finder's "Go" menu, click "Go to folder..." and type "/Volumes/SNOWLEODVDNAME/System/Installation/Packages
Open OSInstall.mpkg (not .pkg). Continue to hard drive selection. Choose your formatted, clean Snow drive. Click Customize and UNCHECK ALL PRINTER DRIVERS!!!! IT WILL FAIL UNLESS YOU DO SO. I left only the Base checked. Install. If it fails, reformat and try again, unchecking more Customize options.
Install completes. DO NOT REBOOT YET!!!
You'll need this set of files:
http://www.mediafire.com/?zun5nwjyonz
Extract to your 10.5 desktop. Copy over all of those kexts into /Volumes/SNOWLEOHD/System/Lib/Extensions/, chmod 755, and chown root:wheel them. Copy the prefpane somewhere to that volume as well. You'll be double-clicking that once you reboot to install the audio preference pane.
Now, in Terminal, copy over 2 files from your existing 10.5 install to your 10.6 install:
cp -R /DSDT.aml /Volumes/SNOWLEOHD/
cp -R /Library/Preferences/SystemConfiguration/com.apple.Boot.plist /Volumes/SNOWLEOHD/Library/Preferences/SystemConfiguration/
Your EFI Studio settings should carry over to SnowLeopard without a problem. The boot.plist should too, but see the addition you'll need to make at the end of this guide.
FINALLY...update your bootloader.
Install:
http://www.insanelymac.com/forum/ind...=post&id=55844
Install that to the SnowLeoHD, not the 10.5 HD you're currently on. It might default to install on the 10.5 drive. In that case, run the installer twice to install on the SnowLeo drive.
sudo reboot. Boot with arch=i386
I recommend adding that to your Boot.plist.
Welcome.
Update to 10.6.1...all updates are safe.
Forgive the crappy quality of this post. It's 12:51AM and I just got done installing Snow Leopard and wrote this as I went along. Ask questions if in doubt.