ZvP Lategame help me

Hello!

I've been wondering, since starcraft 2 wol beta actually, how to beat lategame protoss (as zerg). Zergs don't really have anything to deal with storms,nor against the late late compostion of protoss (colossus,archon,high templar,void ray).

Basically, i'm asking you guys if there actually is any unit combo, or unit, that could deal with P late game army, especially HT.

Thanks allready ^^