Welcome to WebmasterWorld Guest from 184.108.40.206
I deleted all the pages so everything went 404. This happened around the time of late November so it conicided with my -950 penalty experience. At the time I was worried that 10000 404s had destroyed my rankng so I was pretty bummed. Rankings came back a month or so later so I think it was just a coincidence.
My advise is to let everything go 404. My rankings have improved a lot and I seem to have a lot less supplementals. But just remember "your mileage may vary". Best of luck.