We could do with a scientific calculator. The bundled calculator doesn't have sqrt or brackets. It's too basic. I know there is an AlmostTI emulation but it's too complex to use with tiny keys that are very hard to press accurately.

Another app urgently needed is a wi-fi file transfer. Using bluetooth for file by file transfer is inconvenient and not all PCs have bluetooth.

A Parking app using GPS to mark and locate your car would be very useful. In metropolitan centers one can hardly park close to one's destination.

A wi-fi analyzer which can detect and display signal strength, channels and lock status would be another useful app to have.

These are staples in any platform and I hope they can be filled soon before developers start on more esoteric apps. I hope someone's listening.