Math Nook's Telling Time Clock is a great application that helps teach time. Features include: ability to interactively display a telling time clock along with the associated time; ability to quiz on selected time; ability to quiz on a randomly selected time; highly customizable - all objects including clock may be resized and moved to take advantage of larger displays; uses vector graphics that stay sharp looking when resized; and is interactive whiteboard friendly. Video link to demonstration of this product is available on www.mathnook.com in the Teaching Tools section or video can be found by searching for "telling time clock mathnook" on www.youtube.com.