Captions are a big one... literally. Instagram does not restrict the length of captions when you upload an image but cuts them when displayed. I want to add like and comment lists (as well as commenting itself) but I'm struggling to make them look good (autmoatically cutting the text and so on).

This also touches Emoji support, which I want to do sooner or later (but have to take a look at Harmoji first - and talk to MFaroTusino a bit more).. lots to do still