Proto Page

Jim Licht has a website called protopage.com, that is just loaded with resources for multiple grade levels.

http://www.protopage.com/jimlicht#Untitled_2/Project_PRIME

Smarter Blanced Assessment practice test

Smarter Balanced Assessment has the practice test out.

http://www.smarterbalanced.org/practice-test/.

Howard County Public School Stsyem

They have a secondary math wiki....
https://secondarymathcommoncore.wikispaces.hcpss.org/

Worthwhile Math Tasks

This livebinders resource by danielle Seabold has lots to offer.

http://www.livebinders.com/play/play/187117#anchor

Michigan Online Resources for Educators

They have lessons focused on the common core mathematical practices (and other resources)   

http://more.mel.org/index.php?P=BrowseResources&FieldId=34&myParentId=7637

Arizona Department of Education

Lots of stuff, assessment information toward the top, scroll all the way to the bottom for resources.

http://www.azed.gov/standards-practices/academic-standards/math/

Oregon Department of Education

Wowza!  ... just learned about this one today.  Check it out for yourself.

http://www.ode.state.or.us/search/page/?id=3403

Mathematics Assessment Project MAP

 Awesome resources- lessons, tasks, tests.... and.... common core aligned :)       

http://map.mathshell.org.uk/materials/index.php

Math Common Core Wiki

Chock full of great stuff!
http://mathcommoncoreresources.wikispaces.com/Secondary+Resources

Engage NY

Some resources for implementation.

http://www.engageny.org/

The Teaching Channel

Videos with great content about teaching common core:
https://www.teachingchannel.org/videos?default=1

Kansas Association of Teachers of Mathematics (KATM)

Here's a webite that's dedicated to doing what I'm doing; sharing resources!

They have a great thing going there.  Check it out!

http://katm.org/wp/common-core/

Nevada-Lyon County School District

Nice resource from Lyon County School District.  No lesson plans or activities, but it's still helpful to see scope and sequence, enduring understandings, essential questions and criteria for success in other districts.

http://www.lyon.k12.nv.us/education/components/scrapbook/default.php?sectiondetailid=1021&

Get the Math

Great website about how math is used every day in real life.  Website has short videos and lesson plans.
http://www.thirteen.org/get-the-math/

PBS Teachers

PBS teachers has resources for all subjects.  They are not necessarily documented as aligned to common core, but certainly fit the bill in most cases.

http://www.pbs.org/teachers/classroom/6-8/math/resources/

Share My Lesson

An excellent lesson sharing space!  You need a login and password, but here you can look at what's there.  You'll have to log in to access lessons.

http://www.sharemylesson.com/middle-school-teaching-resources/

Better Lesson

Great Website!  You need to sign-up for an account to get the most of it, but you can navigate your way around that if needed.  Here's a sample of one tiny little part of it:

http://betterlesson.com/document/409588/u10-probability-probabilitypredictions-docx?from=tree&lessonID=12477#/course/1850/6th-grade-math?&_suid=136861702023305082715783326137

2011 Common Core Academy

I found this wiki, called  2011 Common Core Academy in Sixth Grade Mathematics.  It seems to have some pretty decent tasks.

http://cca6summer2011.wikispaces.com/

Illuminations

Not necessarily aligned with common core standards attched to each activity, but a wonderful resource of high quality lesson, activities, and links to 724 math web resources!

http://illuminations.nctm.org/

Balanced Assessment

Common Core aligned and loads of tasks!
http://balancedassessment.concord.org/

Granite School District

Granite School District has one of the best websites around.  Their curriculum and instruction page is chock full of common core resources.  Pay them a visit!

http://www.graniteschools.org/depart/teachinglearning/curriculuminstruction/Pages/default.aspx

Albequerque Performance Tasks

I found the Albequerque Public Schools performance task website.  It's from 2001 and not common core aligned, but could be very useful.

http://www.rda.aps.edu/mathtaskbank/start.htm

Utah State Office of Education

Their instruction resources page is absolute chock full of common core resources; many of which you'll eventually find a link to, here as well.  You'll spend hours there!

http://www.schools.utah.gov/CURR/mathelem/Instructional-Resources.aspx