Click the report button on the post...

Then, if it's cathartic, post something witty and denigrating (but having no real utility) below it, so Reggie can dump the whole thread safely.

BTW, I just reported two of the four by the spammer in question; all four are down now. Probably someone beat me and reported them first, but Reggie's pretty good about yanking them.

Edit: Man, am I slow...