Very little retail in Kendall Square proper -- MIT Press Bookstore, MIT Coop, a couple of banks, some lunch places. There used to be an independent drugstore, but it closed and wasn't replaced with anything useful. (Hey, CVS! This is one place where your arrival would be quite welcome. You are everywhere else so why not here?)
'One Kendall Square', a few blocks away, has the cinema and a whole bunch of bars and restaurants, but still no real retail.