>1. An alarm clock
This would be pointless as you cannot force Java application to start on every phone "bootup", it will not run device background it will be always on top and you will need to pause it. Not worth to spend time on it. Different story for if you try it to develop for Symbian/Android/Windows ME where you can communicate with underlying device OS
>2.Cash management software
Never need it one such this, plus I do not know anyone using such application
There can be sort of familiar ground if we take some sort of door-to-door salesman, type of person which doesn't run business from shop but travel country and have need to know how much stock company has of this or that item. Then you can create some application that will query remote database, retrieve and present data. Problem is data cost, connectivity issues (long delay, timeout)
For something useful you may want to try create something like password treasure. Sony Ericsson has this option, but there are limitation like maximum characters typed in and description often have to be joined by username in order to be able to fit in password.
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