Heroku.com - Instantly Live Ruby Apps

Heroku lets you create or import any Rails app without deployment or configuration. It’s a completely hosted development environment, so with Heroku your app will be live instantaneously. You can edit all your code and data from the comfort of your browser—there’s no need to install anything, and you can access your work from anywhere, a café in Prague, a beach in Fiji, wherever. Also, as it’s web based you can share your app with the public or collaborate with a specified few—you set the parameters. It’s dead simple. You can develop Rails apps without getting stymied by the complications of installing dev tools. Sign up today to try it out for yourself.

“Hosting is obsolete
When you create or import an app with Heroku, it's already live on the web. No configuration or deployment necessary.”

Heroku simplifies Ruby development, fulfilling a much needed niche. Developers can focus on making cool new tools for the public without having to worry about development. It bridges the creation of an idea to its execution. Users could set up demos for clients, they could experiment with ideas and see how they play out—it’s a great idea.

Will users be able to access a development/editing version of site which they can work with without affecting the live, deployed content? Scaling? Cost?