Software for Sketching

Few art history students use tablet pcs. As far as I can tell, the tablet or convertible is still more the province of engineering students.
I suspect this will eventually change, however, as more and more students find out the advantages of taking notes directly onto the computer. One outcome I can imagine is that some students will want to sketch details of the art. For that, Student Tablet PC provides a nice roundup of several programs designed for sketching.

To Pre-Post or Not to Pre-Post?

All right, fall semester is ending and we've been very much distracted, but here we are again. The question has arisen: when one has the PowerPoint presentation for class prepared significantly in advance, is it wise to post it online? (This is in relation to presentations that definitely will be online after class.)
One of my students suggested that it would be good to have the images ahead of time, and I didn't have any objection in principle. A colleague, however, states that this leads to students simply printing out the presentation and feeling that there's no need to take notes on the lecture.
I said, what, when the only data on the presentation is the image, the artist, the title, and the year?
She said yes, even so.
Let's have some discussion on this!