Links collected by me and found on the web. This list continues to grow.

Blogs
Microsoft Team Blogs – MDT / SCCM / WSUS
Deployment Research (formerly DeployVista) (Johan Arwidmark)
The App Compat Guy (Chris Jackson)
The Deployment Guys (Richard Smith, Ben Hunter et al.)
Xtreme Deployment (Keith Garner & Tim Mintner)
Forums
App Deploy (now IT Ninja)
Ars Technica – Windows Technical Mojo
ServerFault – MDT 2010 / SysPrep
Windows-Noob – MDT / SCCM / WSIM / WDS / Zero Touch & Lite Touch
Microsoft TechNet
Microsoft Management Summit 2011
Drivers
Dell – Driver packs for almost every business-class desktop/laptop that Dell sell. » Desktops – XP, Windows 7 » Notebooks – XP, Windows 7 » Windows PE v3.0 (NIC and Mass Storage drivers only)
HP – SoftPaq Download Manager / SmartStart Scripting Toolkit (WinPE drivers for Proliant servers)
IBM – ServerGuide Scripting Toolkit (WinPE drivers for IBM servers) Lenovo – ThinkVantage Update Retriever Driver Backup Tools CLI: Drvbckp GUI: DriverGrabber, Double Driver, Driver Magician Lite
Scripts
Useful Apps
AppInst – A small program to easily install applications from an MDT deployment share.
Exe2Cab – Converts language pack installers from EXEs to CABs so they can be integrated into Windows using MDT or DISM
GImageX – ImageX GUI
KeepAlive – Prevent machines from falling asleep during LTI
MDT App Export – Export & share MDT applications
MDT MSI App – Quickly add MSIs to MDT either via GUI or command-line
USB Boot Tool – Wizard to add/remove WinPE Boot.wim(s) to a USB flash drive.
Tips, Tricks & How To’s
Drivers
Images / WIMs
Hints & Tips
Password “protect” MDT 2010 LiteTouch (and disable F8 key / Command Prompt)
SysPrep / Unattend.xml etc.
TechNet Technical References