If there is one breakout I wish I could have attended in person it would have been the Apple sMacdown breakout ran by Dorothy Burt and Fiona Grant. They had 6 Apple Distinguished Educators (aka. ADE's) & 2 guru's share 6 tips each.
Sure not all tips will be *NEW* to everyone but it should never be assumed an "old hand" knows it all. Not that I consider myself an old hand, but having been a Mac owner for 5 years I did not know that if you held down the shift key while adjusting your volume you don't get the beeping! I love tips like that! (Thanks Lenva ;-)