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Great app. I remember reading how to do this on Hackaday.com

You could offer a paid account that lets people automatically embed a QR code with custom logo on their site. This would be great for real estate and car sale sites - especially because the QR Code could be copied from page and put on the signs that use to advertise the house/car.

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Yes, an API or some easier features to do multiple URLs may come at some point.

This is a bit different from abusing the error correction as presented elsewhere - this actually encodes the image as data (padding actually) into the QR code so you get a larger area to use for the image and the code is still robust to damage.

All readers that I have tested so far work fine with this method, however it is a tiny bit outside the official QR code spec.

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