This is good for making puzzles for students to use with new vocabulary.
http://www.enchanted learning.com/subjects/dinosaurs/index.html
We use this site in conjunction with our dinosaur unit. There is information as well as interactive games.
http://www.teachnet.com/lesson.html
This site has lesson plans to choose.
http://www.nwlink.com/~wxdude/
We use this one with our Weather Unit. It includes information as well as interactive games for students.