Not everyone is as capable with computers as you are Snuffy. You could say that no one needs Dreamweaver or any other WYSYWIG HTML editors because HTML is so easy to write, but Adobe still makes a fortune out of developing it.
I see your point about motivating yourself to completely produce and maintain an application. I started a project to remind myself of Flex before I started work a couple of months ago called
SpellCast Builder. Although its only simple it works well for building SpellCast equipment sets. I had hoped to add extra functionality to handle rules and variables and things like that but since starting work I just haven't felt like it.
If you want to start a little project for your own amusement that is awesome, if you release it to the general public that is brilliant too. I had fun making my little project.
As a word of warning when it comes to SpellCast XML, do not expect it to be valid in any way, shape or form. I had a hell of a time trying to get a PHP's DOM library to read the bloody XML and convert it into something usable. I ended up converting the entire file to lower case just to make it read the tags correctly, and don't get my started on the XML includes namespace.
Ether way you can get a lot of help from some of the other developers on the Windower Forums, I got some useful bits of information from Yekyaa (Windower developer and SpellCast's maintainer) and Whitewing (develops a couple of apps for FFXI).