One thing I have noticed is that delivery styles often have to be tailored to the room and students that a class is held in. We often have instructors who have "favorite rooms" not only for technological reasons but also because we understand how to move within the space and that we have developed a comfort level within the space. I have found that when teaching in a new space if I can get accustomed to the room before delivery it helps me when I have to start teaching. I also try to gage factors like the time of day, level of the student, and type of course to really determine the best way to deliver material as all of these can be keys to engaging a class. A senior level class at 8:00 am is much different than an 8:00 class of freshmen. These strategies have to evolve over the term to provide the best classroom experience.