Our school provides a weekly school letter each Tuesday, a dedicated prep newsletter on Thursdays as well as communication via the "skoolbag" app. I'm really happy with their communication, although it can be overload sometimes Lol!
The amount we get I can't complain about - indeed it is sometimes overload I think. It is the quality of it - incorrect dates, missing info all the time, and insufficient notification of things for my liking (personally I think if they want you to take time off work, organize care for siblings etc then a week is probably the minimum notice should be giving). Is a bit like that as long as they are sending out communications that is good enough, never mind if they are accurate at all - I don't mind if they are all paper based and come home with DD (like the ones from her teachers) but at least be correct.

They don't use skoolbag as far as I can tell (I have heard good things about that) (but seem to be trialing some other form of web based system Sentral???) - but again it is all a bit sketchy about where to look for what, and what the intention is. Maybe they are focusing too much on the delivery of the communication and not the content - doesn't matter how flash the method if the content itself is wrong or unclear a flash system won't help - I will find someone at the school to ask what the deal is.