The apps from FileMaker sound like they would be good candidates:

##Bento (iPad & iPhone)

Use standalone or synchronize with Bento for Mac. Create and edit custom databases directly on iPhone or iPad or choose from 25 pre-designed templates.

and ##FileMaker Go (iPad & iPhone, with FileMaker for Mac)

Create solutions using FileMaker Pro and access them on the iPhone and iPad using FileMaker Go.

_{Trivia: FileMaker is actually a subsidiary of Apple; they used to be Claris.}

The apps from FileMaker sound like they would be good candidates:

Bento (iPad & iPhone)

Use standalone or synchronize with Bento for Mac. Create and edit custom databases directly on iPhone or iPad or choose from 25 pre-designed templates.

and

FileMaker Go (iPad & iPhone, with FileMaker for Mac)

Create solutions using FileMaker Pro and access them on the iPhone and iPad using FileMaker Go.

_{Trivia: FileMaker is actually a subsidiary of Apple; they used to be Claris.}