While attending LCA it occurred to me that the lecture notes from all the talks that I have given lack a copyright notice. So I now retrospectively license my lecture notes in the manner that probably matches what everyone was already doing. The Creative Commons web site has a form to allow you to easily choose a license. So I have chosen the below license, it applies to all lecture notes currently on my web site and all that I publish in future unless they contain special notice of different license conditions.
Update: From now on I am releasing all lecture notes under a non-commercial share-alike license. I had previously not given a specific license to the content on my blog – now I am specifically licensing it under a non-commercial share-alike license. This means (among other things) that you may not put my content on a web page that contains Google AdWords or any other similar advertising.
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.