Speak to Reddit about a trial period using their system embedded into our wiki. In the future we could look at linking the log-in system, outsourcing to Reddit, or producing our own solution. As an example of the also see Reddit embedded in the main page. The XML could easily be taken to fit nicely on the front page, this is just a quick embed from the main site.
<html> <IFRAME SRC="http://arxiv.reddit.com/hot" Width=700 height=500 FRAMEBORDER=0 SCROLLING=NO> </IFRAME> </html>