The 123 boot install:
Quick resume about "oh, what to do now?"

#1 - Burn .iso on a CD;
#2 - Boot this CD;
#3 - When Darwin prompt appear, eject CD and put Mac OS X Leopard Retail DVD;
#4 - Press enter (or -v and enter...wherever...)
#5 - After install, boot using CD boot again and install .kext needed...and usual files.
#6 - Done!

For the time being, you cannot have this bootloader on an USB stick and have it boot the Retail Leopard DVD. The reason why this
happens is related to the way the BIOS handles DVDs and optical media: there's no BOOT DEVICE associated with an optical drive
which the BIOS has not booted from. Basically, this is like the disk swap trick known to the PlayStation gamers.
You can already put this on an USB stick/CD/DVD and boot a vanilla install (vanilla= no added kext, no replaced kext on the partition).

As usual, this only works for compatible machines(that means you still can't boot a vanilla system on AMD, they need specialised patches).

What are you going to do in the future?

David Eliott said he'd merge some of the things from Chameleon into boot-dfe. Those involved in the development of Chameleon will merge
the support for ramdisks into Chameleon and more effort will go into making the distribution 100% legal.
Work might(read: should, in the very close future) also go into making Chameleon boot the Retail DVDs when loading the bootloader from the HDD.

User guide and link to the ISO

This ISO needs to be modded (add dsmos to the Extensions folder) in order to be able to boot Leo.

Credits for this go to:

David Eliott: for modding boot to allow us to boot from Retail Leopard DVDs;

Kabyl: for modding boot to allow the usage of a separate folder on the disk and merging features from Chameleon to boot-dfe-146;

bumby: for compiling syslinux and figuring out how to build the ISO;

ToH and HMBT: tests and improvments;

Superhai, STiCKpIN: for good methods and research day-by-day;

Patched 'boot' file supporting JMicron, Boot.plist and device-properties strings: here

Download .ISO Original with project kexts (all your need is here - noobs try this first): http://www.mediafire.com/?uwd9dtttjfk

Download .ISO with modified kexts: http://www.mediafire.com/?1ne1zbl4znv

Superhai Method to edit image: http://forum.insanelymac.com/index.php?s=&...st&p=803725

STiCKpIN *NEW* Method to boot from USB Stick (needs Windows): http://forum.insanelymac.com/index.php?showtopic=115064

HMBT Auto-Patch for edit image (Beta): http://homepage.mac.com/f41qu3/.Public/CDBoot_RC2.sh

Chameleon for Hard Disk: http://tinyurl.com/6je4eh