Wow! what a blog. It's just in the last year that I've learned how to manipulate images. This started with @shaka's lets make a collage contest.

You have great tips. All the software I use is free--so I especially like your tip on Paint 3D magic select. A lot of my effects are accomplished by using GIMP tools.

I agree that images and content complement each other. Often, when I'm stuck, I'll make a picture and then the direction of my post will come into focus. Works for the reader, and me.

I'll be checking your links for more tips :)