The college is participating in a 6 month pilot of Mendeley a software package that allows you to save and manipulate your PDF documents and generate bibliographies from them.
This began on the 1st of July. Mendeley has always been available to use freely however, this pilot will allow you to collaborate and create private groups free of charge. At the end of the pilot if the Library does not subscribe to Mendeley, you will be able to carry on using the space allocated to you and your group privileges until you leave the college and no longer have an Imperial College username and password. After that point you Mendeley account will lose access to the Premium service with 20GB of web storage and the ability to work in groups of up to 25 collaborators and it will revert to what is available free which is 2 GB of web storage space. Of course you can continue to store your papers on your workstation using the Mendeley Desktop version.
For more information see Mendeley pilot
Also refer to my link to a 2009 article in the Guardian