This is a very good strategy. what you do is get both zergling upgrades, speed and faster attack, also upgrade carapce and attack to level 3, and have 2-3 bases with a total of 20-25 hatcheries(or hives but get at least one hive to upgrade adrenalin glands). Have 30 workers all on minerals and get overlords till you get 200 supply. If you quick you should have this done in no time at all. after all is prepared, make zerglings like there is no tommorrow! When you've maxed out supply, set as many zerglings as you can in control groups. The hardest part is organizing the attack. keep making a box and sending zerglings you have to send them all fast for this to be effectful. even if they have a lot of air, the zerglings will still ravage their base. remeber to have a few workers on gas for the upgrade.Also remember that as soon as you see a larva to make zerglings and send them to attack once you have like 50 or 100.

CreepColony's Opinion: Splash damage units, like lurkers, will slaughter your zerglings.