The Effect of Web-enhancement on Classes – Quantitative Research.

An article by Wingard (2004) ,
Classroom Teaching Changes in Web-Ehanced Courses,

"assessed the kinds of changes that occur in face-to-face instruction when faculty add Web enhancements to their course. "

It comes up with some expected and unexpected results. The affected faculty expected the following:

• more efficient face-to-face interactions, better class discussions
  
• more active learning,
• less lecture
  
• more readily available practice and feedback opportunities for students, and
• more student-centered instruction.

That was essentially the case; moreover, “an unanticipated consequence of continual and comprehensive student access to course materials and resources was an elevation of faculty's expectations for students" [emphasis mine].

Where change was noted it was much more likely to be positive.

Source: Educause. Follow link in first sentence for full article.