It was billed as 'A Gathering to Re-Imagine the Smithsonian in the Digital Age', and you can view the program, participants, etc, at http://smithsonian20.si.edu/
Some of the discussion is linked from http://smithsonian20.si.edu/discussion.html
, a wider range of comments is available via a twitter search for #si20
or in your favourite blog search engine.
I don't know if anyone else has been following the discussion in the blogosphere/twitterverse, but I'd be curious to hear what you all make of it.