Algebra

On-line interactive activities

The Shodor Education Foundations; a large selection of self-checking interactive algebra activities.

Active Algebra; A neat site from the UK with some interesting algebra problems.

Explore Learning: Quizz-like activities for different areas of algebra. 

Saxon Home School Enrichment activities. A selection of formal algebra activities based on the Saxon Math Program.

The Math Forum; Problem of the week; includes previous problems of the week. 

Purple Math; A large selection of Algebra activities categorized by level of difficult.

Cut the Knot; "An interactive miscellany and puzzles"

MathsNet; A new site; could be interesting.

On-line algebra courses and content resources

ThinkQuest; Seeing is Believing; An on-line textbook. A good resource for terms and procedures. 

Math.com Algebra quizzes and more.

Algebra.Com: A virtual course in Algebra. A lot of resources; maybe too much!