The 2008 Journal Citation Reports have been added to Web of Knowledge. You can access them from http://www.isiknowledge.com.ezproxy.liv.ac.uk/JCR.
Note that JCR now includes figures for 5-Year Impact Factor as well as the established (2-Year) Impact Factor.
TIP: The quickest way to get to Journal Citation Reports from the library homepage is to click on Databases and then use the Search Database Titles box (under Locate and Search a Specific Database) to search for JCR. A search for Journal Citation Reports will of course work too, or a even search for impact factors (we try to second-guess you!).
Remember, you can create your own list of favourite databases, see http://www.liv.ac.uk/library/electron/erdatabase_help_my.html