Scopus is a new database from Elsevier. It indexes 14000 peer reviewed journal titles in the sciences and is advertised by its makers as the largest database of scientific literature.
The Library has a free trial of Scopus. Go to http://www.scopus.com - if you are on a CFS machine you should get straight in. If you are off campus, you will need a University Athens password.
Please let me have your comments and thoughts, and please get in touch if you need any more information or experience any problems.