i know MS has a little program (part of the "Power Toys") that handle metadata display for RAW files called "RAW Image Thumbnailer and Viewer for XP".  

i haven't used it so i'm not sure how it handles other image formats (i use Bridge to search metadata)

outside of the PowerToys, i can't think of any add-ons for MS but i'll take a look

:)
retrocity