In one week, I went from Top 50 gold where I was stuck to top 8 platinum. braveZOMBiE.532
My win rate against Terran is like 90%. Now that I've figured out how to hold the initial bunker rush, it's more like 100%.
I just remember being stuck in Gold and then winning like 15 straight vs gold, platinum and eventually diamond.
If your ZvT could use some work, this guide ROCKS.