Something that people often forget when dissing vectors and SVG in particular, is that they're _scalable_ - so you can use the same version everywhere. So, you send the logo SVG once, and you could use it for the main logo on the homepage, smaller footer logo on the rest of the site AND for the favicon, because it'll scale. Browser just downloads one SVG file once, instead of 3 different bitmaps. Obviously, this is in everything-is-made-of-marshmallows ideal world where Internet Explorer doesn't exist, but hey.
Technically SVG is scalable, but not in practice. Small icons need different design than large icons, and SVG doesn't solve that. Look at fonts, they have hinting system to indicate changes for different sizes. Without similar system, SVG can't produce icons that truly are scalable. It's especially important in small icons like favicon(16x16px) which I believe will be hand drawn for long time.
I think that Apple does resolution independent icons by embedding several bitmap versions with a vector version in their icon files. That's the way to go in desktop applications, but similar system would produce too much overhead without significant advantage in web.
True, although the hinting is mostly just used for when things get tiny. SVG works well from sizes from 32x32 up to infinity, which is fairly impressive, I think.
