The opening Keynote Speech by Peter Turchi was very good. "Get lost" - and experience what you have never experienced before. I agree that's the key of OOPSLA. That's why I come to OOPSLA. And I have lived almost entire life with this joy of getting lost (encountering an unfamiliar thing).
The panel of "Celebrating 40 Years of Language Evolution: Simula 67 to the Present and Beyond" was educational to me. The languages are increasingly getting functional. And multiprocessor hardware is making concurrency the main issue of the coming future.