Stop Google Web Accelerator in your Rails apps (See related posts)

class ApplicationController < ActionController::Base
  before_filter :disable_link_prefetching

  private
    def disable_link_prefetching
      if request.env["HTTP_X_MOZ"] == "prefetch" 
        logger.debug "prefetch detected: sending 403 Forbidden" 
        render_nothing "403 Forbidden" 
        return false
      end
    end
end