3 Zealot Rush

Start mining and make probes. Take your 7th probe and build a pylon near your nexus. Send that 7th probe to scout. Take your 8th probe and build a gateway and send it to mine. Then build your 9th probe and build your second gateway and send it to mine. Your first gateway should be done so build 1 zealot. And build 1 more probe. Once your first zealot is done your second gateway should be done and you should have 200 minerals. Build 2 more zealots. Once they are done imediatley rush. This works extremely well if you have a another protoss partner. I have done this many times and it has worked very well. 90% of the time the person I rush dies. whether they are a newbie or not. This does not work well against terrans who have bunkers. After the rush get detection and more gateways and finish off the other opponents.
If you dont like to rush, then build up a good amount of men and make sure you have templar. Get 3 arbiturs and hallucinate them. Send in the hallucinations and your real ones straight to their Nexus and recall. Everytime I have recalled like this is has worked. It only failed once when I recalled with the range of 12 seige tanks.

CreepColony's Opinion: This is a really good strategy against Terran.