I'm very pleased that New Relic have been kind enough to sponsor our conference! New Relic have been busy doing some great things recently: RailsLab, an educational resource focused on Rails performance and scaling has recently produced an excellent series of screencasts by Gregg Pollack, and they also recently launched a new version of their RPM product.
New Relic is the leading provider of Rails application performance solutions. New Relic's RPM is used by more than 1500 Rails organizations to monitor, tune and troubleshoot their applications. Try RPM Lite for free at http://www.newrelic.com/RPMlite.html