Hi, we received this question (as well as showing friend ips) before so I will just be lacy and copy the response from then :-)
We have received the same question before: Is it really that smart to show the IP address of your friends?
The policy we have so far is that we expose all information that is trivial to get (like the IP-address of your friend). We do this to avoid confusion, we want people to know what is hidden and what is not.
We apply the same policy during friend-forwarding. If you recognize the hashhash in the search packet that started the forward (perhaps because one of your friend is sharing that torrent with you) we will show the name of the torrent in the friend forward table. If you don't recognize it we show 'unknown' instead. Again, we do this since that information is trivial to get.
Basically we want all security in the system to be because of the protocol and algorithms used, not because of what is displayed in the ui and what is not. The system can be pretty hard to understand already, and we think that full disclosure is the best way to give people a better feel for what security that is provided.