A little more than two years ago, engineers on the Chrome team began a very ambitious project. In coordination with Adobe, we started porting Flash from the aging NPAPI architecture to our sandboxed PPAPI platform. With last week’s Chrome Stable release, we were finally able to ship PPAPI Flash to all Windows Chrome users, so they can now experience dramatically improved security and stability as well as improved performance down the line.
via Chromium Blog: The road to safer, more stable, and flashier Flash.