Cool image re-sizing video

I wonder when this technology is coming to a WordPress/FireFox near you? I'm always frustrated by having to re-size photos to a specific column width (450 pixels in my blog right now), and then manually linking the pictures to larger versions (usually 1024 pixels wide). This cool technology should allow me to just upload an image, attach it to the post, and then it re-sizes depending on the theme or the browser used.