For years, I've touted Webelements.com as the top periodic table resource site on the 'net, and it still probably is.
But if you're looking for a periodic table, then Webelements isn't for you.
Instead, as found by one of the students in my first bell, I'll now be recommending PTable.com. Head over there and check out the awesome options (the tabs up top) that allow you to link directly to videos, podcasts, photos, wikipedia articles, or the webelements page for each element as well as what information you want displayed on the main page.
Dig the coolness, folks...dig it.