How the Apple iPhone taught me that 'good enough' can be better than 'best'

I went to my local Apple store, yesterday, to pick up a copy of the newly released iWorks 8 (which is very good, in case you were wondering).

While I was there, I took the chance to have a little play with the iPhone. It was the first time I had actually seen one, in the flesh. There is no doubt about it, the phone is incredibly impressive. However, whilst I was playing with the contacts manager I suddenly realised that the design was very poorly thought out. There was an A..Z strip on the right hand side of the screen, but the letters were far to small for me to accurately select the correct one. In essence you end up pressing U, V, and W at the same time.

I thought about this for a minute - wondering if I had missed some important 'Zoom' button - and then it suddenly dawned on me. It doesn't matter. By pressing in approximately the right area the phone jumped to the right'ish part of the my contact list, and with a couple of screen flicks I was where I wanted to be. By designing a 'good enough' system, Apple had actually made the phone much more usable.

All of which makes me wonder what things I am over designing or over perfecting, which are actually reducing the value to users?