While I’ve never attended a Gel Conference in person I’ve definitely benefited from the content that has been placed online afterwards. There’s always notes, and photos from attendees placed in one spot. If you dig a bit further you can find videos of some of the talks. This year was no different in that you can check out how people experienced their April 24th and 25th, 2008 (and years before that) in New York with Gel.
Going back through the years it’s a good time capsule on what tools were available to share content. Back in 2003 it was mostly quotes, over time flickr allowed people to tag photos and create slide shows. Now there’s moving video that I can embed at the top of this post.