This blog post explains how to write unit tests in Ruby for a Google App Engine / JRuby application.

This blog post explains how to set up a Sinatra app with JRuby and the Google App Engine development server so you don't have to re-warble and restart the dev server on each modification.

This post describes the few steps needed to package a Rails app into a war and deploy it on a Java application server, in this case JOnAS. This is actually pretty straightforward, no reason for the Java production environments to refuse our nice Rails app anymore.

Dont't you think phpMyAdmin is old and gray? For Rails Rumble, our team bootstrapped an opensource web-based mysql admin with conventions, some ajax and other cool stuff. More info and a screencast here.

Keyboard navigation for TextMate stacktraces: A JavaScript snippet for TextMate to be able to navigate with the keyboard through the stacktraces links.

An HTML view with sortable tables for your pl_analyze reports backed by Merb is described in this post.

MassiveMusicQuiz is a multiplayer music quiz written in Rails and that makes intensive use of Prototype. It has already served up to a thousand players simultaneously.