Google has announced a preview release of Google App Engine, an application-hosting tool that developers can use to build scalable web apps on top of Google's infrastructure. The goal is to make it easier for web developers to build and scale applications, instead of focusing on system administration and maintenance. Leveraging Google App Engine, developers can write code once and deploy as well as absorb spikes in traffic. With automatic replication and load balancing, Google App Engine is designed to make it easier to scale from one user to one million by taking advantage of Bigtable and other components of Google's scalable infrastructure. Developers using Google App Engine can make use of built-in components and Google's broader library of APIs that provide plug-and-play functionality for simple but important features. The preview release of Google App Engine is limited to the first 10,000 developers that sign up, all of whom will be restricted to the free quota of 500MB of storage and enough CPU and network bandwidth to sustain around 5 million page views per month for a typical app.