Wiki Lesson

I think the http://www.wikispaces.com/ is a great resource for teachers! It is another way for teachers to collaborate and bring new ideas into the classroom.  I shared my  Solid, Liquid or Gas online photo album and slideshow.  This  lesson is a very easy tool to assess if students understand the differences between a solid, liquid and gas.
http://ktwelve.wikispaces.com/Solid%2C+Liquid+and+Gas

This a great website to help students learn more characteristics about a solid, liquid and gas:

http://www.sciencekids.co.nz/gamesactivities/gases.html

I feel that http://www.wikispaces.com/ is an easy tool for 5th graders to share their ideas on.