Lighten is a new app for the iPhone and iPad. This is a very simple program to use, very fast, AND fits well in the smallest iPhone screen. Lighten is a simplified version of the XMIND program for the PC and Mac that has been stripped of unneeded commands so that it works extremely well on the handheld devices.
The universal version for both iPhone and iPad currently costs $2.99.
If you read my blog and wonder how to get started in mind mapping, this is a very good starting point. Simple to use, easy to understand, very well designed mind maps that are easy to read.