There is going to be a New Avengers/Transformers crossover comic from Marvel and IDW.  You can read about it here at Wikipedia.  You can also read about it here at IGN and see one of the up and coming covers featuring Catpain America and Optimus Prime.  I had heard about this a while back, but I couldn't really find any information on it until now.  I being a fan of both The New Avengers and The Transformers Series, I am very excited.  It sounds as if they are going to be in continuity as well, so it should be interesting.  Happy Viewing Everybody.