Kindlegraph

I said it would be cool to add your signature to an ebook at a signing and three days later it's real!

It sure would be cool if I had a million dollars...

...

I'll let you know what happens on Monday.

As for the above, it's a good first start but their invasion of your Twitter privacy is a deal breaker (not to mention it's only for the kindle and I prefer the nook).

Progress!