Know that you shared a great link, but can’t for the life of you remember it, or even how you shared it? Trunk.ly collects the links you share via Twitter and Facebook, making it easy to browse and search through your link-sharing history.
Developed in Melbourne, Trunk.ly is pretty simple to use once you've signed up -- there's an on-screen display of your more recent shared information, and a simple search dialogue.
There's also an import tool for Delicious, if you're making the switch following that service's demise, and options to add RSS feeds to your collection of bookmarks. You can also export data from the service.
How useful Trunk.ly is will depend on how often you share bookmarks. If you're only doing that occasionally via a single service, it might be overkill. If you're constantly using multiple social tools to share bookmarks, it could be handy, and it's also a neat way of seeing shared links separated from the rest of your social networking stream.
Trunk.ly is a free service, requires registration. It's in early beta right now, so the site warns that processing links may take a while.