XPERT – project is a JISC funded rapid innovation project (summer 2009) to explore the potential of delivering and supporting a distributed repository of e-learning resources.
It has a very useful search facility that allows you to attribute resources to the original creator. A great resource for finding and using images and video without fear of copyright infringement.
You can see what XPERT is about and why it is useful by watching this video clip:

Twine is a new service that helps you organize, share and discover information about your interests, with networks of like-minded people. You can use Twine alone, with friends, groups and communities, or even in your company.