This is a fine answer, but the problem the user asks is very real. I've dealt with other programs
(picasa, for instance), that store meta data elsewhere. It becomes a mess when you want to
(almost inevitably) switch programs. I have no reason to believe that Lightroom, great as it is,
will be around forever, or be my preferred program. Of course, there could be problems with reading the file format as well, but JPEG (IMHO) is more likely to be readable than adobe's lightroom database format!
I really want to be able to easily recreate my set from a simple directory structure and set of
files. Ideally, if there is a simple workflow to 'export' an image after it is edited (a keyboard shortcut perhaps) - that would be adequate....