One idea, as much time as you've spent on that XML class, you could forgo it and use a SQL db, and create a subscriber based website that people pay X amount per month to login and do all of this. You're choosing XML for portability on people's individual computers, right? And then create a standalone windows gui.

If you'd be wanting to try and make a buck off all the time invested in writing the tool, then you'd have to create it as shareware, and also spend time on a protection scheme (which of course means ya have to Fort Knox it against crackers), or make it a website where you get ongoing payments, and alot less work protecting it. Just an idea.

One thing I've learned to hate about writing my software based on other people's services, is I'm at the will of whatever changes they decide to make without notice, which breaks my software. I got about 3/4 of the way through a slick tool that worked with Mobsteradd.com, and literally, overnight they changed it around so much without notice, it rendered the entire app useless, with no way of saving it.