So, what about these pictures?
I used simple things like lines to test my anti-alias code changes. When that was looking good I wanted a more complex example like a fractal. A fractal with a lot of details takes a while to generate, so I decided to look for something simpler and quicker. This is the result.
If you put the previous image side by side with this one you will see the difference that anti-aliasing makes. This one uses a simple average on four point on grid within a pixel. In sub-pixel coordinated, the sample points are (0.25, 0.25), (0.25,0.75), (0.75,0.25) and (0.75, 0.75).