What it is: You really can’t beat free clip art and this collection of clip art beats all I have seen for the classroom.  Phillip Martin has created a great educational collection of free clip art for classroom use.  Great features: it is easy to use (when you click on a subject or topic you are taken straight to the clip art selection, this is not true of most free clip art sites), there are no advertisements flashing and taking you to other clip art sites, all of the clip art is perfect for educational use, and the clip art…