This presentation was about the resource libraries (now LOR in 7.x) in ANGEL and was presented by some of the staff of the University of Waterloo. They have a rather large resource library available which faculty are allowed to contribute to (peer-reviewed). It contains learning activities along with global documents such as student policies. They did a small usability study to see how it could improve. Some hilights:

The findings match up with some of my experience. The upcoming version does alleviate some of this by allowing you to publish from the LOR instead of only using the import screen. More usability studies would be useful though.