An excellent and FREE alternative to Adobe Photoshop for general graphics creation and image editing, The Gimp can be downloaded from www.gimp.net. Windows users should be sure to download and install the proper Runtime Environment before installing the program itself.
I've been trying it out recently and like it a lot. Having gotten a new machine not long ago and misplaced my Photoshop installation disk, I was glad to find this alternative. Many of the tools are the same or similar to those offered by Photoshop so it is easy to just jump in and start working intuitively, learning as you go. If you want to add graphics to your blog or edit your photos before posting them, and you have some time to learn a new tool or Photoshop experience to guide you (but no money to buy Photoshop itself), then this might be the perfect solution.
I welcome suggestions for any other free programs you have found useful for chess blogging.