The general viewpoint seems to be that Australian TV is pretty poor. However there are some gems, so maybe people can recommend their favourite Australian TV shows;
If you like football (soccer) there is a very funny show called Sam Santo and Ed. Unfortunately it is on Fox Sports now so you need Foxtel to watch it (I think it is 7pm on Mondays). They review the weeks matches, mainly A-league but also international matches too. If you were thinking there isn't much good Australian comedy on TV hopefully this show will change your mind. It was essential viewing during the last world cup.
There was also a very funny show on ABC called Upper Middle Bogan. It has finished now so look out for the next series (hopefully there will be one).