My teacher takes her extension history class to the syd uni lectures every year and apparently they always go down well, so they can't be that bad. We had the modern history guy (Dr Brennan I think his name was) come to our school and give us the lecture on WW1 to just us. It was really good. Also my extension teacher is also my ancient teacher and she takes us to the study days in ancient as well. Once again those ones seem to go down well.
I heard about an Extension English Two study day where the guy basically read them the syllabus... I think this one will be a lot better than that.
If anyone wants the notes from the study day, I'm happy to do swaps, my notes are sorely lacking in other areas. Just email me (screaming_silently877@hotmail.com) and let me know what subjects you have good notes for.