dead link?

  540 Chemistry and allied sciences

Chemistry (BUBL)
Chemistry (Yahoo)
Chemistry (WWWVL)
Internet chemistry resources (Rensselaer Polytech.) - very comprehensive resources, classified by type (e.g. software) and subject. Look especially at "teaching"
World Lecture Hall - CHEMISTRY section (Univ. of Austin Texas) - a collection of university courses from around the world, organised by subject. In some cases actual lecture notes, images etc are provided online, often in concise form. Can be very useful aid to the student .
Web Elements (Mark Winter, Univ. of Sheffield, UK) - online interactive Periodic Table.