Adobe Evangelists Daniel Brown, Juleanne Kost and Tim Cole have a web site: AdobeEvangelists.com
With tutorials about Photoshop, Premiere, After Effects, GoLive, ImageReady, InDesign and Illustrator, AdobeEvangelists.com offers a wide range of useful information–for free.
Some of the titles available for Photoshop CS are:
Camera Raw in Photoshop CS
Photoshop CS Power Shortcuts
Blend Mode Magic
Photoshop for Microscopy
Photoshop for Law Enforcement
There are also tutorials going back to Photoshop 6.0–many of which are still relevant today.
There’s also a link to Juleanne Kost’s online gallery of illustration, encaustic painting and photography.
It’s worth the trip. . .