When you go into a session course like http://2013.imoot.org/course/view.php?id=469, it would be really good if if could display the start time (in the user's time-zone) and/or a countdown timer. Surely there is a block for that? Perhaps this is just an idea for next year.
Great idea from Tim - also in the ideal world maybe a reminder system - select the sessions you wish to attend and get email or other reminder 15 minutes before?
Keep up the great work
+1 reminder system
While waiting for a specific session to start I explore other sessions, watch another replay, read the resources, (hunt for more badges), or even say yes I can help you now to the person at the door. A reminder to come back when the session is ready would help me attend more live and less on replay