It would be really nice to be able to see a yearly overview of totals with the months next to one another on the same screen.
Ideally with the ability to filter what you want shown on the graph. (Like All income, All expenses or individual categories) this would really easily allow you to see trends and how you are progressing month on month. (Obviously an average line would be great too.)
Another ability to view month on month how you've been progressing against a goal throughout a year would be nice too.