The people at radar have been doing some work. I logged on and was directed to a new screen. Instead of the usual picture stream, with the most recent uploads listed first, I was directed to a page with new options including 'latest comments on my pictures', 'on my firend's pictures (hmm flickr doesn't do this) and 'on pictures I've commented on' (flickr doesn't do this either). The page still lists the most recent uploads in a small box on the left hand side and also lists the number of pictures uploaded and comments made by each of my friends. You can still access the original stream by clicking on the 'pictures' link at the top right. Interestingly, and this is a problem in the ui design of flickr as well, there is no way to get back to this original page once you navigate away from it.

Another interesting fact, I now have fifteen radar friends and of those fifteen, only two have actually uploaded pictures and only four have made any comments on my pictures. It seems that my friends are using radar just to view my stuff rather then participating in any kind of social way. Three of these people don't have camera phones, a very valid explanation, and the others have various excuses from their mobile phone plan to hatred of their camera phone's pictures. Hmmmm...