The latest WebKit nightly now has a decent amount of SVG+SMIL (animation) coverage. By my old school grading system, that gives WebKit a solid 'B' grade in terms of SVG support (75%). This is what I was talking about a few weeks ago and I'm quite happy to see it happen! If they cleaned up their regressions from a few weeks ago (some problems with SVG patterns, I believe), they might even crest 80%.
Thanks to Mike, I now have Webkit SVG results to show at my SVG Support page. Current (April 2007) Webkit builds score a 55%, which is roughly comparable to Firefox 3 nightlies. Firefox 3 adds support for some Filter Effects, while Webkit currently has better Text support. For a first release, this will be fantastic - congratulations to the Webkit team!