I got this question a few times at Dreamforce this year so I thought I would quickly cover it. If you don't want all the System Administrators to see this or would just prefer a specific user(s) get the details there is now an easy way to do this.
Go to Setup and run a quick search for "Apex Exception Email"
In the expanded section click on "Apex Exception Email"
From here you can choose either a Salesforce user or users and/or to a non-Salesforce user email.