As a blogger the biggest challenge I face is finding good relevant images for my blog posts. There are quite a few free stock image websites out there. One relatively new one raising its head is Picjumbo. Picjumbo is operated by Viktor Hanacek, who is a webdesigner by profession, and definitely an amazing photographer. The site is still relatively new but contains a collection of high quality images in various categories including technology, people, architecture, etc. The photos are completely free to use even in your commercial works.