Feature Pages – open in new window?

Firstly, I must say that your theme and service are awesome! I love how well thought out most things are and your response time has been great for the few questions that I have had. Just wanted anyone reading this to know that.

Is it possible to have the feature page boxes link to an external page and open in a new window? I have a client wanting to encourage site visitors to sign up for something that is not based on their site – without leaving the site to do so.