This projects details the Internals/Implementaion of BitLocker Encryption system for Vista.

NVbit is a linux fuse driver to access Windows Vista's Bitlocker Volumes from linux, provided you have the right keys.A white-paper and supporting presentation is also available.The research was done around an year ago.Work was stopped prematurely,Don't expect things in clean/finished shape.The code is in alpha state.
Both the paper and presentation are incomplete draft versions. However, missing things can be referred from nvbit source code.NVbit allows read-only access.(Though writing can be done just in reverse order but still it doesn't exist for now).

What is Vbootkit?

A bootkit is a rootkit that is able to load from a boot-sectors (master
boot record, CD , PXE , floppies etc) and persist in memory all the way
through the transition to protected mode and the startup of the OS.

http://www.securityfocus.com/columnists/442

Vbootkit White-paper and presentation materials

The vbootkit white-paper and presentation slides are now online and can be downloaded below.

BOOT KIT is a project related to custom boot sector code subverting
Windows NT Security Model.The sample presented currently keeps on
escalating cmd.exe to system privileges every 30 secs.

It has several features

1. It's very small.The basic framework is just about 100 lines of assembly code.It supports 2000,XP,2003
2. It patches the kernel at runtime(no files are patched on disk).
3. BOOT KIT is PXE-compatible.
4. It can even lead to first ever PXE virus
5. It also enables you to load other root kits if you have physical
   access(Normally root kits can only be loaded by the administrator

The bootkit has been tested with a number of kernel mode shell codes such as Loading Native Applications and drivers from the shell code

another shellcode ,which periodically raises every CMD.EXE to system privileges.

The Source code will contain 4 levels of BOOT KITs(showcasing different payloads)

1. Basic framework ( Kernel patching has to be done later on) ( available for download )
2. Privilege escalation framework(demonstrates creating new system
   threads and how to escalate privileges easily) (available for download)
3. Loading drivers and native applications from kernel mode without touching registry
4. PXE compatible code(Basic framework).

This is required because even if you exploit kernel vulnerabilities, you still cannot load any driver because almost all existing Antivirus solutions hijack the NTOSkrnl API's ( which let you write to specific registry locations, load drivers etc).