If you're an Amazon.com addict but don't have a Fire, Silk could become your go-to browser. Silk is unique because of its "cloud acceleration" ability, which renders Web sites extremely quickly using a combination of the SPDY protocol developed by Google and computing power provided by its own cloud-based servers. Silk is also known for the ability to learn from browsing habits and predict which sites will be visited next, in some cases. Note that you can protect your browsing habits--but also slow down the browser--by disabling the predictive browsing.
Once you've rooted your Android, the process for installing Silk is quite simple. The XDA developer, TyHi, created an archive to download, which you then manually copy over to your Android and install.
Amazon might be working on an official port of Silk to other devices and operating systems. As early as September 2011, almost two months before the Fire's release, Amazon was found to have registered domain names that indicated a broader roadmap for the browser. It also had included language in its terms and conditions that indicated multi-system support was in the works.
Amazon has yet to respond to questions regarding third-party ports of Silk.