Links to websites with Photoshop resources and materials:

Adobe Marketplace and Exchange – official Adobe site for add-ons, join for free

Retouching Vimeo Group – useful collection of tutorial videos (including some of the ones on this site)

QBrushes – free Photoshop brushes

Texture Lovers – high quality free textures

Media Militia – collections of free shapes, brushes, graphics and textures

Tutorial Sites:

Russell Brown Tips – the great Photoshop eccentric is endlessly informative . . .and entertaining!