As you may know, the new dnndev.com is built on top of DNNSocial, which is running on top of DotNetNuke PE. One interesting feature of PE is that you can switch users. Yet, I don't use the feature much because I have to logout and log back in to get to my original user. Instead, I use Google Chrome's User Profile feature which allows me to be logged in as 2 users (or more) at once with no conflict