Man, i hope this is true! This would ruin Kerry!!
I heard him (Corsi) deny it on Sean's show. Unclear to me, though, was whether he was talking about film showning Kerry pissing on the flag, burning the flag, or both. In any event, if such film exists, it would have to be somehow authenicated -- it's too easy these days to fake this stuff. For example, I was at a location that will remain nameless this week and saw Registered's picture of Fonda and Kerry together at the same rally (and told them it's fake).
I suspect an October surprise, if any, will not come until after the end of the debates and likely will have to do with his service record given they have only released but a fraction of what's there. However, even that may not help much because the White House and even Cheney as recently as Tuesday night have recognized Kerry's service in Vietnam as honorable.