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 :)

You already probably know those few parameters that are used to compare lenses and define their performance. But not many people know about bokeh. It is an interesting aspect of the lens and can tell something new about the optics and their design.
Bokeh is a Japanese word - the transliteration of a Japanese word for "blur" - describing the subjective aesthetic quality of out-of-focus areas of an image projected by a camera lens.
Here are a couple of articles that can explain this in details:

• "What is Bokeh?" by Ken Rockwell
• Understanding Bokeh by Harold M. Merklinger

One of the issues we all encounter is the power sources that make our digital gear alive. There are many types of sources and many variables that affect their work. In the article posted at SmartShooter.com I found about a new rechargable batteries that can could solve most of your problems and save you a great deal of money. I have to note that to read this article you have to regitster on the website.
These batteries could replace your AA alcaline batteries, but it may not be the solution for some of other issues. Such as power for your external flash, your professional camera or laptop on the go. But there is another manufacturer, which produces great (but somewhat expensive) solution to these kind of issues. And the name of the manufacturer Digital Camera Battery. For my 550EX flash I purchased 40W battery, pro-cable and the case with the belt clip. The cable allows the flash to burst almost every second - recharge time is a bit more than one second.
To learn more about various types of batteries - read the article written by Ken Rockwell.
You may want to look as well at one of the previous posts here - Initial conditioning for NiMH battery (Thursday, October 14, 2004)

The following is an excerpt from the same document that was mentioned in the previous post. But I decided to include it in this post, because there is one issue, which concerns the focusing in AI Servo AF Mode - first frame could out of focus. So there is a good reason not to shoot single shots in this mode. And below is the explanation of such behavior:

"There are two issues at stake here: the first is focus tracking and the second is a phenomenon known as “release-time lag” or “shutter lag.” In One-Shot AF, pressing the shutter button halfway locks the focus. When the camera is set for AI Servo AF and the shutter button is pressed halfway, the AF system begins tracking the subject. If you simply press the shutter button down without waiting for the AF to function, the shutter release might lock up or be delayed in One-Shot AF. Under the same conditions, the shutter will release without focusing in AI Servo AF. This is true with or without the use of an AF-Assist beam. Conversely, pressing the shutter button halfway and holding it there until you are ready to shoot allows the focusing system to lock focus in One-Shot AF or start tracking the subject in AI Servo AF. Pressing the shutter button down all the way once focusing has been established will release the shutter in the shortest possible time, thereby increasing the odds of capturing “the decisive moment.”

Even before I got my 1D Mark II, I spent some tim browsing the internet and looking for related information. It was good decision, because I found one important aspect of the battery that I didn't know before. As every car has it break-in period, it seems NiMH batteries have similar period or rather specific techniques how to get the most of the battery pack. There is an article and forum thread that describe this aspect and steps that you have to do when get a new NiMH battery:

• D1X Tip: breaking in the EN-4 battery
• 1D Mark II - Initial battery conditioning?

Using those tips my 1D Mark II can get over 1200 shots from a single charge of the battery. Isn't it great? :)