I use:-
Carbs and cals (iPhone app)... A quick reference for most foods and drinks on your phone or iPad.
Gi &GL counter (Hamlin books £3.99). A great pocket book you can carry around with you.
My fitness pal (iPhone app)..... With this app you can input your total meal and drink input over a day and it will give you a breakdown of food and drink consumed (fat, protein, carbs calories). I use it about once per month.... It also predicts your weight, so you know if you are heading up or down. Allow a couple of hours to fill in all your details at first, but a very interesting a useful tool.