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Dia, a diagram editor for Linux and other platforms, uses a format which vaguely resembles SVG internally. It has export to SVG and some other interesting SVG features, including the ability to define new diagram plugins in a language which is a subset of SVG.
I'm not familiar enough with SVG to judge whether changing Dia to use SVG as its own native format would be hard. I do believe this is being considered. (And it's open source, so you can try to add SVG support yourself if it's important to you. :-)
For more information, see e.g. http://freshmeat.net/projects/dia/
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