Proton Don - Practice the elements and their symbolds at this fun site where the degree of difficulty of the questions can be moderated from easy to medium to hard.
Element Information - This site offers an interactive periodic table that allows you to learn more about each specific element by clicking on it.
Periodic Table - This site offers a periodic table along with descriptions of the various ways that elements are organized within the periodic table. There is also a quiz at the bottom of the site that you can take to check your understanding of the periodic table.
Element Song - This is the site you need to go to if you want to hear the element song that we all know and love. 