This is an ever-growing list of Blogs, twitters, links, research, and professional development that I have found helpful as I have grown as a teacher.
Edutopia: a great read for educators looking to improve what we do
Math Blog: a great blog from David Sladkey, high school math teacher from Naperville Central High School
Math Blog2: another great blog, this one is from Jennifer
Webquests: this is a site with lots of high school webquests
Desmos: Calculator utility that is so much more.
Teacher Desmos: Teacher side of desmos, great lessons and tools for teachers
Khan Academy: Amazing tool for individualized math learning
Schoology: Facebook style communication tool for CM201U students and families to connect with their teachers and curriculum
NCTM: National Council of Teachers of Mathematics; especially if you are a member there are articles, new ideas, and professional development for math teachers
Here are some of my favorite youtube videos which I use to get focused, or get refreshed, or be challenged
This is Crete Monee High School - WE ARE WARRIORS