CarChopperz: Forum for those that enjoy using PhotoShop to edit car images to change their appearances (Chops).
Computer Arts: Official forum of Computer Arts Magazine. Help with advanced questions.
Graphic Forums: One of the best places on the web for graphics collaboration and Photoshop Battles.
Official Photoshop Forum: Adobe's official Photoshop forum. Expert help.
Ozone Asylum: Where digital artists meet and exchange ideas. Advanced techniques.
Photoshop Cafe: Specializes in illustration and pre-press techniques.
Savva Photoshop: Home of the latest PhotoShop tutorials, discussions and tutorial suggestion. Over 2000 members, with daily tutorial updates plus new ones every week.
SitePoint: Answers to advanced questions. Tutorials for web and print.
Yahoo! Groups : Adobe-Photoshop: Group helps each other with solving problems, report and discuss bugs, and provide each other with knowledge and tips. Open membership and unmoderated, archives for members only.
Yahoo! Groups : Photoshop-Haven: Caters to the discussion of Photoshop, its plugins, and all aspects of digital design, image creation and image protection. Restricted membership.