On the website CambridgeInColor.com you will find a whole bucnh of tutorials on digital photography. A few of which I would like to point out:

• Common Obstacles in Night Photography
• Photoshop Curves
• Local Contrast Enhancement

If you are in infrared photography then the website "Invisible Light" is your source for related information. This website offers not only photographs, but links to books, articles and other resources. Just spend a bit more time following those links.

An interesting article about using photography to distort reality - as it was done in the last century (or even earlier). And I would notice that in those times Photoshop was not an option .
This article has a bit more to me, because it has examples from the past of my motherland - Russia. Those examples describe how Soviet Government used photography for propaganda and adjusted the truth to their wishes.

Another fruitfull website beatifully called "Mountain Light" with many inspirational articles. There you can find as well many creative photographs of nature and landscapes.

While searching for George Lepp and his articles on the web (see previous post) I found an interesting article with a technique about using flash in nature and landscape photography. It's called "Flash Magic" - Interview by Rob Sheppard. And while you are there, don't forget to look at other articles on this website. Such as "Learning from a Master" by Moose Peterson.

UPDATE:
Here is another article on flash in nature and landscape photography - Smart Flash Outdoors by Galen Rowell.