rubyonrails.org' Ruby on Rails 0.13 and AJAX are excellent, powerful, easy to start test-driven Web applications. AJAX support built into Ruby on Rails 0.13 eases next-generation browser-based development. Separation of concerns in Ruby on Rails 0.13 assists in easing code maintenance over time. A developer says Asynchronous Java (AJAX), eXtensible Markup Language (XML), and Ruby on Rails have been very useful in Web development. Rails and AJAX have shown their mettle, but application programming interfaces (APIs) are still fluid, tools are only now reaching the market, and very few books are available. Users have to learn Ruby, which many regard as a Python clone. There are very few Ruby programmers, and, even though Web services are supported, management and integration tools are not as powerful as Java or .NET. Integration of Rails applications into a service-oriented architecture (SOA) will require some manual coding. Scaling the application to process actual loads could also require some slick server tuning. Ruby runs on just about all platforms, and a Common Gateway Interface (CGI)-enabled Web server for production will be needed. Fast-CGI would be preferable, and Ruby on Rails 0.13 connects easily to MySQL, PostgreSQL, SQLite, Oracle, SQL Server, and DB as shipped. Rails is attractive because it adheres to DRY principles and has separation of concerns that spur experimentation and speed up iterations.