What I'd like to see is a true MS Office document. It would have multiple tabs (like an Excel spreadsheet). One one tab you might have a Word doc and on the next tab an Excel spreadsheet and on a third a PowerPoint presentation. All in the one document. Is such a thing doable?

I don't think it's possible, but it's definitely an excellent idea, I've never thought of that. MS should do this, it won't be too hard in terms of programming.