Using powerpoint (or related tech) enables sucking at public speaking and presentation skills, in a way that lecturing in front of a {black,white}board does not.

One of my favorite education-related blogs is University Diaries, by Margaret Soltan (an English professor at George Washington University). She writes quite entertainingly and excoriatingly about the use of PowerPoint as an alternative to teaching: http://www.margaretsoltan.com/?s=powerpoint