An answer to 5: "Are there interesting alternatives (other than blackboards or smartboards)?":

Another possibility is using a tablet pc with an active digitizer (not the customary iPad-like tablet - writing on those is a pain) or a graphic tablet/stylus solution.

After you invest some time in it, there are several benefits. Apart from the ability of recording one's lectures, one can teach sitting and facing the students rather than the blackboard, copy and paste previous material, easily make drawings with straight lines and circles.

You can find an example of a a Calculus course taught this way (pdf and avi) by an excellent teacher that knows how to use this technology here (in Italian; Google-translated version of the page here).