Books ( on and off the Internet)
Amazon
Barnes and Nobel
Harvard Bookstore (Harvard Square)
Starr Bookstore  (Harvard Square ) - This one is rather good.

... and if you are in Mumbai (India) - please do take some time off to visit the Strand Bookshop in the Fort area of downtown Bombay. It is really a good bookstore. And keep a lookout for some priceless books found on the pavement bookstores in the same area.

Films (on and off the Internet)
Brattle Theater
Harvard Film Archive
Coolidge Cinema
Kendall Square Cinema