I have a website that I made using ruby on rails at http://www.tradespring.net. I want to create a bunch of instances, like http://www.tradespring.net/electronics, http://www.tradespring.net/automotive, ect. where these sub-sites work exactly the same as the original but each have their own set of posts, but users are the same across all sub-instances.
Where could I start looking? I don’t even know good keywords to google at the moment.
You can start with two best webcasts created by Ryan lately which explains creating multitenancy application in Rails.
[update] Oh! I missed that these are pro webcasts. Though you can check source code of these webcasts.