A lot of the places featuring doujinshi downloads (pretty much everywhere other than directly from the scanlators/scanners) are dead now--the existing filesharing sites have time-limited downloads and when MegaUpload went down it took a lot of links with it. That's also pretty :files:y which people may not like; I feel comfortable that a simple database without links would ruffle no feathers. Maybe having the option to log in and flag things as being part of one's own collection, available for trade, or desired for trade would be a cool feature.