Since I couldn't find a cheap Prius stalk to replace the stock wiper arm for front intermittent delay, I ended up installing a 'Rain Tracker' rain sensing wipers control system (model RT-50A from
http://www.raintracker.com)
The package arrived on Friday and I spent about 1 hr installing it today. I have to say I'm quite happy with the result -- check it out:
http://www.youtube.com/watch?v=woW1Z38GDok
-toy