It is looking increasingly likely that Firefox 1.1 will have built-in SVG support. This is great news for the fledgling technology ;-)

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Updated 2021 : note that the above post is out-of-date, given this post was originally published in 2005, but is left here for archival purposes. I have unlinked the external blog that was linked from here (http://www.mozillazine.org/talkback.htmlarticle=6393), as it is now dead.