Sometimes there are useful comment about content on external websites, like Hacker News or multiple subreddit. It would be really nice to have a plugin or something, that displays number of upvotes on specific url at other services, number of comments.

Also there is a case, when i import a lot of old bookmarks and many of originial urls are offline. Permanent copies are wonderful, but you can't go back in time, unless you can with archive.org. So i'd be happy to see links to archive.org somewhere around old bookmark