The leading organization for Photoshop professionals, the National Association of Photoshop Professionals (NAPP) offers a wealth of information, tutorials, freebies, an expert help desk, employment listings, and some so-so discounts for members. Photoshop User magazine is a great resource with timely Photoshop news and articles, and all members receive it bimonthly.
NAPP's reasonably priced membership is worth the magazine alone. NAPP is the organizer of the world's top Photoshop conference: Photoshop World, www.photoshopworld.com. NAPP members receive a significant Photoshop World conference discount.