Nik LePage suggested it would be a nice incentive for reviewers to get a link back to their website. And he's absolutely right :)
So, whenever you review a module, you'll now get a link to your website right inside the review! The more reviews you write, the more links you get. These are real links, too, none of that cheesy no-follow stuff.
If you're trying to attract new clients to your website, this might be the perfect opportunity to show off your Drupal expertise!
Registered users can set their link by going to My account > Edit > Links.