While wandering through forum topics I've found a couple of articles that tell about how to Calibrate Adobe Camera Raw 3.x. The other article (Out of Gamut: Calibrating Camera Raw in Photoshop CS) is what the first one was based on.

If you need to calculate DOF, Parallax or Field of View for your photography needs, you may consider the page "Photography Calculators". Unfortunatelly it hard to take it with you in the field, when you need it most.

Another interesting topic of discussion - importance of precise focusing. The article called "The Flawed State of Photography as Art and Documentation" talks about how even a slight shift of focus can change the expression of the person (subject of the photograph) and how hard is it to achieve. At this website there are a few more articles that explore the focusing issues in photography. The posted articels somewhat old and may not reflect the current situation, that's why you should take it with a bit of salt :). The articles are the following:

• A Calamity in the World of Art (Judging Artworks by Slide Reproductions)
• Why No Camera Can Focus
• Focusing Tests
• The Flaw in All Auto-Focusing Cameras: the Messraster Focal Point Exact Screen
• Why the Most Important Invention in Photography Is Not Available

Browsing through various websites I encounter interesting pages, here in the section called "Molecular Concepts in Digital Imaging" you can find several articles about underlying technology used in digital photography. Among those are: Anatomy of a Charge-Coupled Device (CCD), CCD Saturation and Blooming, CCD Noise Sources and Signal-to-Noise Ratio, Digital Camera Readout and Frame Rates and more.

In this articles you will find a lot of technical information about the digital photography. Want to know how light creates a digital image - look at Film versus Digial. There are other articles, like DOF and Diffusion
Demystifying the Confusion, Tones and Zones, Digital Histograms and more. Well, now I am going to read some of those articles myself :)

Do you want ot learn photography lighting and start it from the very beginning, where everything is crystal clear? Here is your chance - PPF LIGHTING WORKSHOP (Lighting Dynamics) by Ed Shapiro. You can post your questions and ideas, they will be answered. This is the Must Read for almost every photographer.

May be some of you know that Ed Shapiro, which articles I have on my website, was sick for a few months. Thank God, now he is well again and back to business. It seems that he still has the same level of energy as before, so he become a moderator and prolific contributor to the the
ProPhotoForum - Professional Photographers Forum. This forum dedicated to every aspect of professional photography and you can find there answers to many of your questions. There is a special section of the forum - Ed's Workshops, which you may want to pay a special attention :)