I learned the phrase chalk and talk from Thomas's blog. The idea is that you don't need much more than some human beings in the same place talking, and some kind of chalkboard or dry erase board to convey the spelling of a proper name once in a while. I found it interesting that the dictionary definition, and some other links I found, used it in derogatory way. The beauty of this approach is that it is simple. No bullshit theory about learning styles, how some people need to be tapping their foot when learning. Just the primary text, some human beings, and a place where they can meet together.
Even the way I use blogging is chalk and talk. It is must me, talking through my keyboard, and some people reading what I wrote. I'll put up an image only when I need to or feel like it. Powerpoint is nothing more than chalk and talk with some images and special effects added, and the text done ahead of time. I'm sure it's useful it you want a legible form of a mathematical equation, or are teaching art history. The same way a music professor needs a piano in the room and / or a way to play recorded music. There is no reason, however, for denigrating traditional chalk and talk methods of teaching. Socrates probably didn't even need chalk.