With all the talk ecosystems and app deficits, what are YOUR indispensable apps?

I'll probably have the shortest list of all.

IMPOSSIBLE for me to live without (and be contented)



useful apps on the side

barcode scanner


and... that's pretty much it

I am not including other core basics like the camera and email client, more the added things people tack on.

What about you all? What is this newbie smartphone user missing out on that is so essential?