The list is endless.... windows mobile, palm *, blackberry, iphone.
The major market is probably going to be iphone and windows mobile.
As long as it works on these 2 , it will have a large potential base.
The features listed in the thread are great. I can think of the following which
might be helpful and add value compared to existing s/w:
* Questions and theory sorted by area. The
GMAT club tests and verbal cover
a large number of questions, which could be sorted and used as initial data.
(e.g. In Quant: Number theory/Geometry/Inequalities! /Probablity etc)
( e,g. In verbal: tense/subj-verb/pronouns/etc).
* Ability to make/add note similar to an editable
error log/tracker.
* Adding a level to question would be awesome.