While looking for more details about the HDR technique, I found:

• Cambridge in colour: tutorials, techniques and gallery. I learned here first about local contrast enhancing then discovered digikam has a plugin for it. I like this site very much;
• Photocritic blog. Happens to have interesting articles from time to time;
• HDR Crème a very good many examples of what HDR should not be. Exaggerating the dynamic range flattening of a HDR capture gives ugly cartoonish, flat images for most people, it seems.