Photoshop

 Bungalow 104: Photoshop notes and tutorials

 Good-Tutorials.com - over 2,000 Photoshop tutorials

 Pattern-Bomb: Photoshop patterns and info

 Photoshop Tutorials & Photoshop Plugins | PhotoshopSupport.com.

 That Wicked Worn Look - effects

 The Photoshop Guru's Handbook.

 teamphotoshop.com - tutorials, tips, and help

 veredgf.fredfarm.com: Photoshop brushes and tutorials