Nice things are being said about the following "Number Line App". I tested it out (no students as it is summer) and it appears to be very interesting, clean, and useful. I would love to get a math teacher's perspective and some students feedback. It is currently free in the App store as of 8/4/2009 at 12:34 AM CST.

This app was developed as part of the Learning without boundaries challenge and was the winning selection:

http://www.lwbva.org/images/title.jpg

Here is the official blurb from their press release:

Number Line is designed to help students learn about fractions, decimals and percentages. Students earn points by placing equivalent fractions, decimals, and percentages in correct sequence on a number line. The application features multiple levels of increasing difficulty.

Well congratulations ... We agree that there is a lot of potential here! Thanks to Edu_mac_nation for tweeting about this app.