Presentation: Jon Udell, Microsoft

James Alexander, co-founder of Zopa and Green Thing.

Ordnance Survey's Liz Ratcliffe presents at the Guardian's Activate Summit.

Channel 4's commissioning editor for education and new media delivers a lightning presentation at the Guardian Activate Summit.

The shadow minister for science and innovation.

The former minister for transformation calls for better access to government data and a more open approach to technology within government.

Blue State Digital's founder and the man behind the Obama presidential campaign's digital strategy talks with Emily Bell on the power of technology to initiate a new era of democratic action.

AMEE's Gavin Starks delivers his lightning presentation at Activate.

Steve Papa, Endeca, gives his introduction for the panel session on the internet and civilization.

Next in our series of mind-blowing lightning presentations is Microsoft evangelist Jon Udell.

Our fourth mind-blowing lightning presentation was from Tom Steinberg, founder of mySociety, a non-profit, open source organisation that runs many of the best-known democracy websites in the UK.