I don't recall Hillary's exact words on the October surprise but I would imagine they can be found on FR and the odds are good they or a link to them are on one of the TM threads (which is were I might have first read them.)
These are linked on my homepage, see "Links."
Hillary Predicts October Surprise
March 30, 2004
http://www.freerepublic.com/focus/f-news/1107999/posts
Hillary Predicts October Surprise # 2
March 31, 2004
http://www.freerepublic.com/focus/f-news/1108408/posts