I'll start this thread off with a shapshot of Friday morning's course of sales for ANZ. ANZ closed at exactly $14 on Thursday (Nov08 expiry) and some think their short options are safe from being assigned. See below for the list of $14 options exercised.
The codes EP and EC obviously distinguishes whether they were puts or calls.
The biggest danger of being assigned is that you either end up owning the underlying shares or are short them, leaving full exposure to any overnight gap. Probably even worse for credit spreads where the short side is assigned and the long one expires worthless. What was a limited risk trade is no longer protected.
Also, most option brokers automatically exercise in-the-money positions. How much ITM can vary between brokers, so it pays to know their policies. If long are long an option that is 1c or so ITM and it's not worth incurring fees to close, it would be advisable to check with your broker and request them not to auto exercise if necessary.
Will add to this thread as time allows - hopefully others will also add any useful nuggets and experiences to this thread ...