Hey,
1) My Idea/Suggestion is that you add information (in the footer) about who is currently viewing this thread.
For example:"Currently Active Users Viewing This Thread: 2 (2 members and 0 guests)2) My 2nd Suggestion is to add Online/Offline information below the Avatar/JoinDate/PostCount.
User1, User2"
Reason: Sometimes you are discussing something with a person, but you are not sure if (s)he is still online/or viewing the thread.