I-pods and learning

A report on the BBC website today highlights the fact that the Department for Education and Skills is making Shakespeare's "Much Ado About Nothing" available to download as MP3 format to help pupils revise the set text. Several geography colleagues already make MP3 evision material, notably Ollie Bray who has produced some very helpful casts on physical geogrpahy, for example. I wonder how such projects are evaluated and what research has been done, or could be done, to identify the effectiveness and "market penetration" of podcasting, wikis and blogs as educational tools in Scottish schools?