The nice and adventurous people at Google have done it again with the Google Catalog Search beta. You enter search phrases that appeared in mail orders catalogs (that's printed, paper mail catalogs) and they search for them returning a page with the words higlighted in yellow on the original catalog page!

That this is technically possible is not surprising, especially not for a happy Acrobat Capture user, but the logistics of this particular search engine must be hell. From the looks of the pages on the site is does not look like Google received electronic versions of catalogs, but just hired someone to scan them all, page by page.