i usually grab an extra pair of ear plugs from work. they're not the fancy musician ones with filters or whatever though, they muffle the shit out of EVERYTHING. we've gone to custom fitted ones but mine are out for repair, maybe i will have them back by the Buffalo show and i'll try 'em.
i think i wore plugs at the beginning of the '07 Montreal show but i took them out, didn't seem so painfully loud in the 12th row.