Achieve 3000-this site allows students to read articles and answer questions pertaining to the articles. The site begins to level the articles based on their level of understanding. We will start using this website next week, so the class will be familiar with it shortly. We do this during our "listening to reading" center during Daily 5 rotations. I like this website a lot because kids can search for articles that interest them, the articles are at their reading level, and then they answer questions based on the article.
Sumdog-this site allows students to practice math skills and the more they "play" the more customized the questions will get based on the concepts they grasp/need more review on.
IXL- This site also has math and language arts practice problems.