Ok, after googling a bit for this, I understand that this must be a FAQ by now, but I still need to ask :-)
I have used Akismet since long and it works fine but do get rid of few missed spam trackbacks, I have now installed and activated Spam Karma too. Both seem to be working fine together but there is another plugin available which claims to make Akismet and Spam Karma work together.
Do I need to install that additional plugin? What extra does it offers?