well i have saw that not so many members has been add it a signature to his profile, for those who are interested in adding a signature to profile, u need just to go to your profile press the edit button and then update profile tab and go to forum settings, where u can add your own signature. remember signatures are a very useful thing for the search engine, even if my forum is not so populate it but google will still find u.
so ... go on now and show me your signatures...