I didn't know Aaron, but a whole lot of people whom I admire and follow did, and they have a lot to say. Just to put them in one place, for future reference
Larry LessigPosted by oook at January 13, 2013 12:15 PMRemember Aaron tumblr
...and Ron Nigh adds Glenn Greenwald in The Guardian
...and The Digital Archive's Aaron Swartz Collection, crowdsourcing "any digital materials you think appropriate in a memorial collection: emails with him, code archives, photos"
...and a Twitter hashtag #pdftribute (via Kerim)
Jason Scott, acerbic but believeable
and Dan Gillmor
and Gardner Campbell, who points to Matt Stoller's post, among others I've already noted above