I just thought I'd like to share an app I've been working on for a while.
Ketchup is an app for storing agenda and meeting notes online. We
designed it to be as simple as possible.
The app is a standard Rails 2.3.5 app, completely restful, running on
Engine Yard Cloud. It handled a fireballing and a lifehacking with
150+ concurrent users at peaks in the last few days on a single EC2
It's at http://useketchup.com if you want to check it out!