I haven't got an iphone or a proper smart phone. My mobile phone is an SG-T749 (Samsung Highlight), it's a 3G but I don't use it as a 3G phone. I only use it for making voice calls as I haven't got any data or internet plan.
Consequently, I am totally ignorant about iphone apps.

I am interested in hearing from people who have an iphone and use its capabilities in entirety. I want to hear what kind of apps they think will be useful for an iphone and are not currently available or shortcomings of apps that the have used.

Ideas could be put into a project of developing iphone apps. The emphasis is on travel applications but other domains will be considered too.