See Ruby/Rails does scale

Updated LinkedIn Blog Post If yellowpages.com or a whole bunch of other sites or the Friends for Sale facebook app wasn't enough to convince you, that yes, you are on the right track with Rails (no pun intended). Another solid Rails app has been mentioned in mainstream media http://blogs.zdnet.com/enterprisealley/?p=188 blogs about a Facebook app done by the LinkedIn Light Engineering Development team. Cranking out mac daddy throughput rate - 1 billion page views / month. Enough said. Go read the article and watch the (excellent) video. Then get back to the business of building hot Rails apps.