Speaking of Node.js, Heroku—the Ruby deployment platform—started offering experimental Node.js support in April. Some notable Heroku-hosted apps have appeared since, including Github Issues from Cappuccino and Pm: a stack-based language.
Node.js—an evented I/O framework for server-side JavaScript—seems to be reaching a critical mass in interest, production usage, and libraries. I haven’t seen a platform become so exciting so quickly since Factor last year.