We have a trial subscription to the Knovel database until August 21, 2009. Knovel is a collection of handbooks in the physical sciences and engineering and allows you to both locate information and manipulate the data for easy analysis. Tables are available as interactive spreadsheets, and you can search for specific property values. For more information about this product, and to start searching, see this announcement. A video demo is also available to guide you through the basics of searching and analyzing using Knovel.
As always, we would appreciate your comments during the trial period. Let us know if this would be useful to you in your classes or your research by e-mailing us at firstname.lastname@example.org.