After having experimented with PowerPoint for classroom presentations a bunch of years ago, I've relegated their use to only very specific circumstances. I want my students to take good notes AND listen to what I say; with a PowerPoint they tend to try to copy everything on the slide INSTEAD of listening. Also, there is an issue with the having to wait on (or worse yet - regress to a previous slide) occasionally for the slower writing students. By writing my notes, schematics and diagrams on the board myself, I am forced to pace my presentation to note-taking speed. Students also have some time to process concepts before moving on as well. I teach in a technical program (Electronics), so this may be a bit more important. Furthermore, I enjoy having the flexibility to go a different direction to address a specific question or area of interest - something not well facilitated by PPT. I enjoy working with PPT, but find I personally stay "in the flow" much better going "old school", and as a result, I feel I'm more effective in the classroom. Just my 2 cents.