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Recently I have started using a program called Paintbrush. It's quite simple to use, and is a bit like paint on a windows computer. Luckily, i no longer own a PC, and was missing the paint application. I Googled "paint for mac" and got this. I've been using it for a while now, and i love it. I use it to make the little graphic mash-ups for my articles here on RantRave.
If you have a Mac, I would highly recommend it. Obviously, it's free, and takes all of two seconds to figure out. Even technologically disabled people should have little to no issues with it. The link in the sidebar is the website you can download it from (just to rub it in, it's the apple site)
As for you Windows users, buy a Mac. Enjoy!