As an iPhone developer, there is currently no shortage of projects so make sure you have done as much of the thinking/wireframing as possible to make the project short, unless you want to pay a high price!
Breaking the project down into its simplest form and delivering key milestones should assist both parties rather than paying hourly
https://spreadsheets.google.com/ccc?key=0AlD_6iEb8Ed9dGs3clV...
As an iPhone developer, there is currently no shortage of projects so make sure you have done as much of the thinking/wireframing as possible to make the project short, unless you want to pay a high price!
Breaking the project down into its simplest form and delivering key milestones should assist both parties rather than paying hourly