I recently posted about a classroom teacher's story about barriers to technology integration in her history class, a "classroom for the future" http://bit.ly/9HMf9Y
From my post, you can link directly to the teacher's M.Ed. thesis, which provides a good first-person insight about the barriers she faced in her attempts to effectively integrate a rich assortment of technology in her classroom.
Here is just one the examples from the "Problems and Shortcomings" section of her thesis:
"The “right click” function is disabled (it is also disabled for teachers, too). This made the copying and pasting of pictures and information more difficult."