Andy’s Early Comics Archive
Andy’s Early Comics Archive. It has a section covering the evolution of speech balloons, and has a large number of scans of pre-cursor comic books. He only goes back to papyrus, perhaps limiting himself to non-carved sources, but there’s a good variety of stuff to keep you browsing for some time.

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FT's Martin Skidmore on August 26th, 2006
It’s very Eurocentric, of course. I recommend my own site for some notes on the roots of comics in Japan, for instance.