Top 9 Math Question Websites and Bloggers for deeper thinking (Shane Loader)

A big thanks to Shane Loader for the following recommendations.

Shane uses resources from the following sites to promote “problem solving and reasoning skills and the flexible use of mathematical knowledge in students”.

Enjoy! I've found them incredible!

The resources:

Which one doesn’t belong                           http://wodb.ca/index.html

Open Middle                                                     http://www.openmiddle.com/

Visual Patterns                                                  http://www.visualpatterns.org/

Robert Kaplinsky’s Tasks                               http://robertkaplinsky.com/lessons/

Andrew Stadel’s Three act tasks               https://docs.google.com/spreadsheet/ccc?key=0AkLk45wwjYBudG9LeXRad0lHM0E0VFRyOEtRckVvM1E#gid=0

Dan Meyer’s three act tasks                       https://docs.google.com/spreadsheets/d/1jXSt_CoDzyDFeJimZxnhgwOVsWkTQEsfqouLWNNC6Z4/edit?toomany=true&pli=1#gid=0

Yummy Math                                                     http://www.yummymath.com/

Estimation 180                                                   http://www.estimation180.com/

Would you rather                                            http://www.wouldyourathermath.com/

Edit: For a maths blogosphere specific search engine, check out the link here.