This is a tutorial for using TodaysMeet, a Web2.0 tool I came across that allows teachers to run a blog or "chat-room" with their students. Although, fairly simplistic, It has enough features that allow the teacher to control settings and make this a worthwhile tool for the classroom.
This site offers examples of what SAMR might look like in a MATH CLASSROOM.
A comprehensive explanation of the SAMR model for transformation of technology-enhanced instruction.