A lot of times, you are just researching a topic, and need to store the link for a couple of weeks. This works great by cleaning up such links after a month.
Have been using it for a over a month now and I don't have to think twice before 30DayBookmark-ing links.
A great way to store Bookmarks for a few weeks. Also shows the most recent Bookmarks first!
Maybe let users know before removing links.