In case you missed her comment to a previous post, Rachel Popelka-Filcoff mentions from Australia that she likes the Dynamic Periodic Table at
particularly how all of the properties are displayed in the tabs, and how one can scroll across and look at things like density, ionization potentials, temperature etc. by moving the slider.
As far as additional information for each element, the links all go to Wikipedia.
Send us your other teaching tips, favorite web sites, etc.