http://geogebrawiki.wikispaces.com/

Linda Fahlberg-Stojanovska has moved her GeoGebra wiki to the Wikispaces platform. Users can now

• quickly upload GeoGebra worksheets
• insert screenshot images using Jing (freeware)
• post equations created with Sitmo (freeware)

Resources available on the site include:

• GeoGebra constructions, explorations, and lessons
• Learn and Teach GeoGebra
• YouTube and Teacher Tube videos
• Publications

We've previously featured Linda Fahlberg-Stojanovska's site, Technology for Teaching "Thinking Mathematics":

http://www.mathcasts.org/mtwiki/

http://mathfuture.wikispaces.com/

The Math 2.0 Interest Group is an international network of researchers, educators, families, community leaders and technology enablers. They collaborate on a variety of research and development projects and conversation threads about social media as it relates to mathematics and mathematics education.

• live weekly events
• Math Online 2011 conference
• email group
• #Mathchat on Twitter
• Diigo collaborative bookmark group
• links to people and projects

http://challengebychoice.wordpress.com/

David Suarez and a colleague have developed a classroom mathematics program that lets students choose their own level of challenge within the structure of the curriculum. His blog offers details of the program, the theoretical and practical basis of differentiated instruction, and the results he's obtained.

• Tiered Instruction and Assessment (a synopsis)
• Implementation Steps
  

  Grading, Reporting, and Retesting
  Finding Tiered Problems

• Tiered Math Assessments
• Tiered Science Assessments
• Videos
• More Reading
• Parent Education
• Perspectives