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Did you make the changes with Windows MobiPocket Reader? If so, the information is in the .mbp files which are not even portable to other MOBI devices. If so, one thing you should do is make a backup of the entire directory, because .mbp files can get overwritten sometimes.
The MobiPerl tools have some capability to read .mbp files, and the command line program mobi2mobi can print information about a MOBI ebook. The command mobils lists a small amount of info on all MOBI ebooks, but this is from the MOBI ebooks rather than the .mbp files.
I'm don't think Calibre will read .mbp files, but in the long term you may be better off switching to Calibre as your ebook management system. It, like MobiPerl, can update the metadata in the actual ebook file (even if the MOBI is DRMed), so it can't get lost. It can also get info from external sources, like Amazon, to update the cover and other metadata. It uses a SQL database to store the information, but this can be printed out for export using a command line program.
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