Free Google Posters plus Google for Educators
While I have been known to complain about using Google with primary grade students, Google does have wonderful services.
One of their lesser known services is Google for Educators: http://www.google.com/educators/index.html
With classroom prep time coming up, here’s a page with posters you can print and hang in your room. They come in different sizes so you can also use them as handouts. Topics include doing web searches, using Google Earth or Scholar, etc. http://www.google.com/educators/posters.html
