I recently gave a talk at a local event here in the UK. The event is for everyone although has a UX angle in its approach and themes.
I speak at it every year and love it but always have struggled to plan out what I was going to say. However, in the last couple of years I’ve used a LucidSpark board to get my ideas down and then organise them afterwards and this works great.
I can now have all my ideas, plus references and links together and can easily reorder them before transferring them into PowerPoint / Keynote slides. Give it a go!