Let's post some motivational youtube/google videos:
1. Dying 47-Year-Old Professor gives a really touching speech...
Dying 47-Year-Old Professor Gives Exuberant ‘Last Lecture’
.... It's a long lecture but really-really inspirational.
2. For GTD fans:
Inbox Zero
.... Lecture given to Google by Merlin Mann.
3. and by David Allen himself :
YouTube - David Allen: Getting Things Done