Here is a recent (September, 2014) full text article about current projects addressing tinnitus and other hearing disorders. It's a good general list and includes some new information that hasn't been posted elsewhere:
http://journals.lww.com/thehearingj...g_Pours_in_for_Investigational_Hearing.1.aspx
http://journals.lww.com/thehearingj...g_Pours_in_for_Investigational_Hearing.1.aspx