It might be late for the larger companies who do hiring through school via career fairs and such. However, I have a few friends who are still talking with some small to mid size startups about internships. It seems to me that the smaller companies don't follow the same intern hiring schedule (or the students that didn't get offers from Facebook, Google, etc are now exploring other options).
Oh Derek, always bragging about your internships at Facebook. Anyway, I think Google is still hiring summer interns. There are always a few stragglers.