A hundred years ago I ran a mailing list called PIM-L - about personal information management. It was surprisingly popular, but I didn't have time to keep it up.
I think Goranson is sort-of-wrong about the software price issue. The real cost is cost of ownership, and cost of ownership of software includes the cost of data loss (or imperfect conversion) related to atypical file formats. Of course most people don't realize this is the real cost, so my point is probably academic. Still, it's a very good reason NOT to buy cool software with neat features that's supposed to hold lots of personal and unique data of lasting value.