Having your own application on the iPhone's App Store has many benefits, from bragging rights to being a respectable source of income. Just how difficult is it to develop your own, take it through the complex submission process, market it and most importantly of all, how much time and money is needed to do it? We spoke to Jessica Abroms, the developer of M.A.S.H., in order to gain an insight into developing for the iPhone and find out how she earned over 375% profit.