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What is it? Trinux: A Linux Security Toolkit was a ramdisk-based Linux distribution that was under active development from 1998-2003. This new project (i.e. ubuntutrinux) seeks to integrate elements (and code, where appropriate) of Trinux with the Debian/Ubuntu mkinitramfs infrastructure to allow easy development and packaging Ubuntu binary (and ultimately package and repository) compatible ramdisk distributions using recent 2.6.x kernels.
Few people know it, but when you boot off the Vista install DVD, you're booting into a different version of Windows altogether: Windows PE 2.0. Stripped away from the Vista installer, it's a remarkably powerful, compact OS.