IXL Learning (www.ixl.com)
© 2011 IXL Learning
This is a subscription math and language drill program organized by grade (K-12), that makes it easy to drill in a school subject. Cleanly designed in Flash, the questions are multiple choice. There's no deep pedagogy here; little help is provided for wrong answers, other than the right answer. Content is organized around generic common core standards. One of the more interesting aspects of this site (www.ixl.com) is how it lists the common core standards. If you're looking for sophisticated graphics and teaching techniques you won't find it here. What you will find is nice clean drill.
$10, Windows, Mac OSX, Internet Site
Teaches: reading, math, basic facts (from counting to statistics)