This idea is aimed at presenting a more seamless development environment. I would like to have the files that I was last working on open automatically when I start working. It seems like this would be a great optional feature to have for the project environment, and the .lvproj file seems like an ideal place for the information to go.
This would be a nice convenience for getting started in the mornings and for working from more than one computer.
A similar feature is found in Firefox and Google Chrome (and probably other browsers), where the browser will load the pages that were open when it was last closed.