Well, most anything I know about the Pelasgians comes from Jonathan Hall's Ethnic Identity in Greek Antiquity, which is a really smart and really thick work, in which the Pelasgians are only occasionally important as he seeks to piece together elements of the various Hellenic constructions of ethnicity and descent.

And I'll go ahead and add that, at least as far as I've been told by the Archaic historians and archaeologists I know, "Pelasgian" is a vague term used nowadays either a) in a literary sense, referring to mythologies of ethnic descent (as in Hall's work), or b) in a historical sense, referring generally to people around the area that we now identify as Greece. Its not connected with any specific archaeological culture, as far as I know, so I'm not sure you'll find any credible historical/archaeological work that tells you much about them. But I could be wrong, I am by no means an Archaic specialist.