Beast Wars The Gathering, a four issue miniseries last year.
Beast Wars The Acending, a new four or five issue miniseries coming out this year.
Megatron Origins, a new comic series currently ongoing right now.
Transformers movie adaptation, four issue miniseries for the movie.
Transformers Movie Prequel, four issue miniseries about the events for TFs leading up to the movie.
I reccomend each of these, so be sure to check them out.