Building on the resume edition I made something to create simple invoices.
http://ooktech.com/jed/ExampleWikis/InvoiceCreator/
I was making things in a more manual way but I wanted to make it more polished and this is the current state. There may be more interest in some of the pieces than in the full plugin. If you look at the preview tab and hover over the preview the section you hover over will be outlined and some buttons will appear. Using these buttons you can reorder the sections or remove them. I am planning on making a more generic tool that lets you give a list of tiddlers and then reorder them like this.
I am going to look at adding the ability to reorder them by dragging and dropping them now.