books books books

so another 'what should i read' post....

i'm hopefully starting an MA in linguistics this september. I have done one linguistics course as part of my undergraduate studies but apart from that and my own interest,i haven't really got anything else to back me up. Neither of the two universities that i've been offered places at send out reading lists or anything in advance so i put it to the community: what should i try and get my excited little hands on this summer to read in preparation???