So this year there is a new type of mini-session being conducted in the Expo Hall called "Chalk Talks". These are held within the Microsoft display itself in tiny theatres that fit around 12 people. I managed to catch Darren's session on Collaboration 2.0 and Paul's session on WPF and I think the format worked well. The only issue sometimes was hearing the speaker as the general announcements going on in the Expo Hall would frequently drown out the poor bloke trying to be heard within a five metre radius.