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