TheBigK - 4:23 am on Sep 20, 2012 (gmt 0)
No, we used auto-internal linking plugin that linked to the pages automatically. So only the manual links (would be <1%) are the only ones that would be 'permanent'. But I can unlink them through another plugin, I guess.
I just checked and GWT now reports 75k Page Not Found errors. Looks like the count's going to go up for a few days.