I alway hear this "sac an overlord to spot the stargate" stuff. Half the time I do it it doesn't work. It really isn't hard to hide a piece of tech from a sloverlord. Damn thing gets shot down before it sees what's in the back corner of the main. And the stargate doesn't even have to be in the main. It can be anywhere on the map.
Was your username, this by any chance? D(V)Lucashome7?
Just found this username from my past history with sc, wonder if that user plays SCII now