On April 24, OKCon 2010, the Open Knowledge Conference 2010, took place in London. I followed it online - (cf. ways.org/en/blogs/2010/apr/25/okcon_2010_as_seen_via_tweets ; mostly via Twitter) - and collected some of the tweets and background information into this 5min video. For tweet stats, see summarizr.labs.eduserv.org.uk/?hashtag=okcon .
For further details, see the official program at okfn.org/okcon and my blog post at ways.org/en/blogs/2010/apr/23/collaborative_conference_blogging_this_time_in_context , which describes a wiki approach to conference blogging: en.citizendium.org/wiki/Open_Knowledge_Conference/Program/OKCon_2010 .