I have an example of what I would like to have crerated.
I would like to offer this as a download to the "general public"-
Changes needed to be made
(I will supply)
logo/name with my company, the color scheme blue, & add 2 graphics.
also some functions added - (that are not in the example)
such as adding more categories under the expenses
ie. lawn cutting fee, basement repairs, yearly land trust fee,
pest control, deck, patio, dock/davit/seawall, foundation, & liens.
For saving the data, I think a simple XML schema would be fine.
.Net 3.5 would be a good choice to support operating systems
(you can suggest something else)
The software does not do anything special it is basically a calculator
There are many in public domain very much like this one.