I've made a page with a list of conference presentations reviewing Scopus and Google Scholar and also Web of Sceince in comparison with the former databases. Three examples follow below:

Jacso, Peter "The Endangered Database Species: Are the traditional commercial indexing/abstracting & full-text databases dead?"[PPT]
UK Serials Group 29th UKSG Annual Conference and Exhibition, University of Warwick 3-5 April 2006.

Jenkins, JR "Article Linker Integration with Google Scholar (or Google Scholar as referring source)"[PPT]
OpenURL and Metasearch: New Standards, Current Innovations, and Future Directions, September 19, 20, 21, 2005, Washington, DC.

Tarantino, Ezio "Scopus, WOK, Google Scholar: too much or not too much?" [PPT]
The International Coalition of Library Consortia Autumn 2005 7th European Meeting, Poznan, Poland 28.09 – 01.10, 2005.

If you have more suggestions, just post a comment. Please note, however, that it should be a conference presentation (i.e., not a lecture) and it should focus on some of the above-mentioned sources.