Work on integrating SVG into Safari (done by integrating KDE's KSVG2 into Apple's WebKit framework) continues apace as described by Eric Seidel, and those of you on the Mac can now grab nightly builds of WebKit with SVG support. They're still unstable, but you can already start playing with SVG embedded directly into XHTML. With progress from all of Firefox, Opera, and Safari, SVG on the Web is turning into more of a reality every day.