I'm working on a talk, complete with an accompanying resource pack and website.
I've never released anything I believe to be of some actual significant monetary value to anyone else before so I'm a little bit stumped.
Here's how I want to license all / any of the content.
Treat this content as if it's an unlimited, never-ending supply of free beer delivered as often as you like in a bottle with a label on. Provided all the "free beer" remains free you can do what you like with, drink it, give it to a friend, remix it, relabel it, share it with your friends. The only requirement is that you say where the "free beer" came from.
If you however you wish to distribute the beer for money, as is or with modifications or as part of a larger pack of other similarly licensed free beers, via any distribution network that generates you revenue, you are required to purchase an additional license from the original provider of the beer.
Which creative commons license can I use?