This site helps you correctly cite all forms of data for MLA free and APA for a yearly price. I highly recommend this site for students who have lots of papers and essays to write.
This is a wonderful program used by Florida Virtual School which enables teachers to have either realtime or taped interactive virtual classroom lessons.
For all you science buffs or science teachers interested in finding a great sight for astronomy, this one has wonderful interactive activities, pictures and videos of the solar system. Check it out.