During Widgetwebexpo, I noticed that there was alot of discussion about paid spread of widgets and almost none about organic spread of widgets. This caused me to change my presentation. There were companies represented there and widget teams that I felt could really benefit from some simple techniques of how to spread a gadget. So I made up a new presentation the night before.
The slides are just the main points of what I discussed, but you might want to check them out.

I would also like to highlight a great presentation about organic widget spread from Google I/O, I spoke of it earlier, but now the entire presentation is up. I recommend watching it.

And here is a great article about getting into widgets, and highlights Widgetbox, one of my favorite widget platforms.