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I'd like to introduce a strong and flexible roach+burrow rush for ZvP that I've been working on. This rush hits at 6:00 with 7 roaches with burrow (they don't all arrive at the same time though). Some key points of why this build can be effective:
1. The roach warren is built after you make a set of lings, so opponent's scouting may be denied. Pretend to send a drone to your natural if need be.
2. Unlike other roach rush builds, not all the roaches are built at the same time once a larva inject pops. This allows you to "cancel" the rush based on what you scout.
3. With proper micro, you basically have an invincible army due to burrow. Retreat and burrow injured roaches one at a time, while the others do damage. This takes practice.
Build Order
9 - Overlord
13 - Pool
13 - Extractor
15 - Overlord + lings + queen
18 - Drone
19 - Drone
20 - Roach warren (once lings chases out scouting probe)
@100 gas - Burrow
19 - Overlord
19 - Drone
20-34 - Roaches, rallied to opponent's base
...expand or continue building units
Against FFE, you're almost guaranteed to do heavy damage. At 6:00, the toss will not have the production or tech to deal with burrowed roaches. If there are multiple cannons at the wall, it's better to walk/bust through, ignore the cannons, and burrow heal once inside the base. At this point, you can probably take down a nexus or kill many probes. The most important part for the rush's success is to burrow roaches one at a time (away from cannon's detection range) once they reach low health. This allows you to stay in the base for a very long time while you either macro up or wait for reinforcements.
I've found this build to be at least safe against 1 base play, since you do have burrow roaches to hold any pushes. It might not be effective against 3 gate sentry expands or the like, but I haven't seen that around in a while. This build may also work in ZvT, as it will hard counter any fast expands.
Here is a replay of the build: http://s000.tinyupload.com/index.php?file_id=22975548121858716384
Let me know what you guys think and if there are any effective counters to the build.