PACE! will give you a pie chart showing the time left for each slide along with the total time left in the talk.
This simple application is well worth the few dollars for any one who does public speaking.
See review retorts here: http://retort.mobi/app/id/tada
Save multiple files, do secret rankings, and get tips if you are stuck. Helps solve dilemmas in a real way as opposed to a random way. A few presses and Tada!