http://www.bertmonroy.com - Photoshop guru & photorealistic artist. Worked with Photoshop before Adobe had it!
http://www.DekeMcClelland.com/ - Author of the Photoshop Bible, among other books, CDs and DVDs.
http://www.russellbrown.com - Adobe Evangelist. Check out his Tips and Tricks section. Tons of free tutorial movies.
http://blogs.adobe.com/jkost/photoshop-training-videos - Adobe Evangelist. Great photographer.
http://www.digitalmastery.com/ - Photoshop Master of layers and layer effects.
http://www.katrineismann.com/ - Expert in Photoshop with photography, making selections, using Adjustment Layers.
http://www.adobe.com/events/main.jsp - Mostly on Adobe software, some events cost for entry, some don't.
https://www.apple.com/retail/learn/ - Enter your zip code to find mostly free events and workshops on new or existing Mac system features, or Mac-specific software. You can also make Genius appointments for troubleshooting your Mac problems.
O'Reilly Media's Community Webinars/Events
http://oreilly.com/webcasts/index.html - Tons of free webinars, mostly very technical, occasionally on Photoshop with Lesa Snider.
http://www.photoshopworld.com - Yearly Photoshop conference in Las Vegas, with many of the gurus giving workshops.
Graphic Artists Guild (GAG)
http://www.gag.org/ - A national union of illustrators, designers, and other creatives who have come together to pursue common goals, share their experience, raise industry standards, and improve the ability of visual creators to achieve satisfying and rewarding careers. Good info on copyright issues and the rights of artists.
KelbyOne.com (formerly NAPP: National Association of Photoshop Professionals)
http://kelbyone.com/live/ - Members have access to tons of tutorials and resources, discounts at yearly PhotoshopWorld conferences, and contact with an international Photoshop community.
Ben's Extra-Strength Photoshop Tips
http://www.digitalmastery.com/ - Ben Willmore's periodic tips and tricks.
GoMedia's Online 'zine for Designers
http://www.gomediazine.com/ - Based in Cleveland, OH, GoMedia.com offers Photoshop tutorials, graphic arts business tips, a great newsletter ('zine), and often lots of freebies.
http://www.photoshopcafe.com/ - Lots of Photoshop news, tutorials, offers.
http://www.photoshoproadmap.com/ - Freebie brushes, textures, lots of stuff, plus tutorials and offers.
Tim Grey Newsletter
http://www.timgrey.com/ - Sign up for Tim Grey's free newsletter on digital imaging. He also has paid yearly subscriptions for more features, like discounts on items sold on his site, ability to ask questions on his blog, and more.
http://www.asmp.org/commerce/legal/copyright/ - This site is aimed at media photographers, but the copyright info applies to illustration artists as well. Good copyright and intellectual property rights info in the Graphic Artist Guild site above.
https://www.designcuts.com/ - A small design company based in London, England. If you subscribe to their periodic emails and create an account, they send freebie deal downloads every Friday: fonts, textures, vector drawings, watercolors, and other artwork you can use in your own compositing in Photoshop (or anywhere else). They also have design
Put Your Portfolio in Book Form
http://www.blurb.com - Blurb makes books one at a time - very unusual in our mass produced world. Download a template and fill in with your images and text. Prices vary according to size and the number of pages. Astounding value for a few books at time. Blurb is only one of many.
PeachPit Press Visual QuickStart Guides
http://www.peachpit.com/ - Great books on a variety of applications, online "club" discounts, periodic emailings if you subscribe. PeachPit started out a local Berkeley company, and is now worldwide.
Browse bookstores, libraries and Amazon.com
There are literally hundreds of Photoshop books, each with a different perspective, from basic learn-the-tools beginning level to advanced color management. Different authors have different approaches to the same topic. Do a search at Amazon, Google, bookstores, and libraries for Photoshop topics of interest to you. Be sure to check the level of instruction or content, generally indicated on the back cover. Before buying, read a few pages or chapters to make sure the author's approach makes sense to you and how you learn. Once you have authors and titles in mind, purchase from an independent bookseller.
Here's SFGate's list of independent bookstores in the SF Bay Area:
The Northern California Independent Booksellers Association list of East Bay bookstore: