Finally. The Surface object now comes with 21 examples - Available for download here:
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They cover most aspects of the extensions - From drawing polygons, to fill data, to blitting, to applying convolution matrices...
I don't think I have changed anything in the extension.
I probably won't change much before the release.
Tiles - I haven't forgotten your alpha channel clipboard request... I will have a look at it after the release, I think.
EDIT: Reuploaded, fixed a stupid bug thanks to Andos.