1. Let me start with the Photoshop guys, Scott Kelby, Dave Cross, and Matt Kloskowski... when it comes to Photoshop and Lightroom these guys are the center of the universe (insert butt kissing sound here) and are a wealth of information. Bookmark their sites and visit them often.
2. If you want to learn about and truly understand lighting head over to STROBIST and Lighting Essentials, there is so much information at these two site it makes my head hurt. When you start browsing their sites it can be a bit overwhelming with all they have to offer, but remember how an ant eats an elephant, just one bit at a time. The cool thing is both these fine organizations have started taking their show on the road with seminars (nationally).
3. So you need motivation to learn all you flash can do? Then head on over to Flash Flavor and view the stunning work of Matt Adcock and Sol Tamargo, work done with off camera flashes. Be sure to take the time and scroll (slowly) to the bottom of their page and see everything stunning image they have to offer.
4. DIYPhotography.net has more do it yourself photography related projects than you can shake a camera at. If you like to tinker AND save money, this is the place for you. Lighting, backdrops, soft boxes, you name it and they have the project for you. speaking of tinkering, not only do they have some great PVC pipe projects (here and here), they also provide you with the link to get Dean Collins 26 page Tinker Tubes plans and layouts.
5. David Ziser will blow you away with his images and the knowledge that he so freely shares with his readers.
6. Another great photographer and teacher is Joe McNally and he has just started blogging. I have read his books, watched his DVD's and have learned so much from him.
7. If I am considering purchasing (yet) another piece of Nikon equipment the first place I stop is Ken Rockwell's site, he does a wonderful job telling you why he likes (or dislikes) a lens or camera and then throws in some images to reinforce his point.
8. Another person who will inspire you with his eye and his knowledge is Vincent Versace, if you could purchase just one Photoshop instructional DVD, it should have Vincent Versace's name on it.
9. The first thing I noticed when I visited Jason D. Moore's site was the "As seen on Photoshop User TV" image and I thought "man, I gotta get me one of those". Jason offers a ton to his readers, video tutorials, great links (though I m sure my absence was simply an oversight), and what I really liked was his blogger profiles. Be sure to check them out.
10. By far the best collection of interviews of talented (and historical) photographers can be found at The Candid Frame done by Ibarionex R. Perello. Really good stuff.
11. Lastly, I think the best place for online training out there is offered by Kelby Training.
The instructors include The Photoshop guys, Bert Monroy, Joe McNally, Terry White, Moose Peterson, Vincent Versace, and Dan Margulis and they will teach you on camera flash, lighting, Lightroom, marketing, workflow, landscape photography, black and white artistry, and much, much more. You can have access to every single course they offer for a mere $19.99 a month or $199 a year ($17.99 a month/$179 a year for NAPP members).
