I have described some of the activities suggested to my dd by a speech and language therapist a couple of years ago here:
http://lmshomeschool.blogspot.com/2011/01/activities-to-encourage-speech-and.htmlYou may find some of them useful for your baby.
It is also worth exploring signing and sign language, which a great tool for language stimulation (although I must admit, I did not explore it with LM as much as I should have). Perhaps there are some classes available in your area?