I have found a strategy that has won me countless #'s of games. For some reason, not many people have been able to counter this strategy. Anyways here it is:

First, do all that stuff that you have to do (mine, get gas, hatcheries, etc.) I recommend at least 16 hatcheries, 6 extractors with 3 drones each and 2 expansions with almost every patch covered by drones. You will need the continued wave of money for this to work (well, maybe). You should have around 60 workers in total. Now here are your units, Around 10 Guardians, 6 defilers, 2 queens, 5 lurkers, and the rest hydras. You don't have to have the exact amount mentioned here, but this is what I usually go with. For offense, have your hydras always go in first to attack. Keep the Guardians back,they are only there for support against tanks. Tanks are a nightmare against Zerg ground troops. If you find your self in a situation against a bunch of tanks, use your Guardians to take them out. If any air comes to take out the guardians, retreat them and let your hydras take care of the air attack. Ok, so the main attack is with your hydras. The queens you can use to expose cloaked enemies or to slow down the get-away of carriers and cruisers (don't you hate it when they try to run away when they know they can't take it?) Also the queens you can use to parasite any creatures that some maps have. The defilers are rarely used by Zerg players which is a mistake since they are a key unit in a good Zerg attack. The dark swarm can be thrown over your hydras and any kind of projectile (except terran seige tank attack, reaver scarab and templar's psi storm) is useless against your units. Be warned that the enemy can use the swarm against you and get under it. But that's where your lurkers come in, just burrow them next or under the swarm. If an enemy gets in there for protection, your lurkers should kill them in no time. So, keep attacking with the hydras while covering them up with swarm as you go in deeper into their base. Plauge is also great and should be used often. Throw it on a bunch of enemy units gathered together and then watch them as they die twice as fast. You should bring around 12 overl! ords for detection and for your defilers to regain their energy. You will use almost all of the defiler's energy in the attack, mostly from using dark swarm. This is pretty much it. Just remember to replace your units as they die. Seems like a hard strategy, but you should get it the first time you try it. This strategy shines in Shared Bases because of the help from your allies.

Like I said, few people have been able to stop this attack. And whoever does happen to stop it, doesn't stop it for long. This strategy is great against the type of people who like to go mass Cruisers or Carriers. Just throw swarm, get some hydras under it and the enemy is a sitting duck. Throw some plague at them for an even easier kill. Oh, and if you have a terran allie, have him throw EMP on the Carriers. WIth the combination from the plague, they should die in a hit or two. You can also use Dark Swarm on your workers if any air comes and starts attacking them from behind the patches.

CreepColony's Opinion: Before you attack, you can broodling the tanks, and once the 2 broodlings come out, all the tanks will shoot at them and kill each other.