Session information tagging

Perhaps some better 'tagging' of each session would improve the selection of wich sessions to go to.
(the current categories, don't hack it)

I found it difficult to make out if a session was going to be a general overview of the subject, or a more indepth technical (handson) experience.

Sometimes I wanted some general idea of a subject I didn't know about, and then it turned out to be a rather theoretical presentation for insiders that already knew what it did.