A quick update:
DEDICATED TRANSPORTSCorsair VenomA traditional Dark Eldar vehicle which first started it's life with the Harlequins many editions ago! Small and lightly armoured but able to put out good firepower for a small transport.
Transport Capacity:
5 Models- Sadly this means that you can't add ICs into your units if you plan to put them in Venoms

Special Rules:
Scout- Helps get the units in the right place and just adds to the Corsair's speed. Outflank can also be a very good option.
Weapons options:
Twin Linked Lasblasters (Underslung)- The standard option but one that you'll want to replace pretty quickly!
Twin Linked Splinter Rifles (Underslung)- The twin linking is nice but if you want poison then the better option is coming up in a bit....
Twin Linked Shuriken Catapult (Underslung)- The standard Jetbike weapon, good for a bit of accurate bladestorming but very short range.
Splinter Cannon- The Usual Dark Eldar setup. Lots of Poisoned shots at good range, can seriously worry almost all Monstrous creatures and can make a great mess of Hordes. Can't touch vehicles though. (The venom can be given two of these)
Shuriken Cannon- Shorter range than the Splinter Cannon and no poison but at a decent strength with Bladestorm it can be a very viable alternative if you are expecting to face lots of vehicles or heavily armoured units. (The Venom can be given two of these)
Wargear options:
Void Burners- Allows the vehicle to Deep strike, very situational but it is only a cheap upgrade.
Corsair Kinetic Shroud- Gives you the invulnerable save that the Corsair version is missing but at a fairly expensive price.
Star Engines- Again a fairly expensive upgrade but makes it a lot faster. Can be great for getting units in position to threaten very early.
Chain Snares- Lets you tank shock, cheap upgrade but in all honesty very situational and the points can be spent much better elsewhere.
Summary:
A lot of Dark Eldar players use these units to great success as cheap gunboats and they can do that job well for the Corsairs too. Set up with either twin Splinter Cannons or Twin Shuriken Cannons they can put out a lot of damage for a relatively small points cost. The Corsair Venoms are sadly quite a bit less resilient than their Dark Eldar versions though so it may be worth spending a few points on getting that Kinetic Shroud to keep them alive.
They can be good for getting Voidstorm or Reaver squads in close enough to use their Fusion guns/Flamers while putting down some decent surpressing fire.
Also remember since they are open topped you can assault out of them!
------------------------------------------------------------------Corsair FalconThe Eldar's famed Gunboat/Transport unit. Heavier armoured than the venom (Although a lot more expensive) and able to select from a good range of weaponry.
Transport Capacity:
6 Models- Slightly better than the Venom, allows you to join a Baron/Prince/Voiddreamer in with your Reaver or Voidstorm squad.
Special Rules:
Scout- An interesting one with Falcons, the ability to outflank can be great with the anti-tank weaponry available to the Falcon. Can help to find the rear armour of vehicles.
Weaponry Options:
Twin Linked Lasblasters (Underslung)- The standard option, like the Venom you'll probably want to change these fairly quickly.
Twin Linked Splinter Rifles (Underslung)- Accurate poison shots, kinda wasteful if you are setting up for Anti-tank weaponry on top of the vehicle but can add a bit of close anti-infantry protection.
Twin Linked Shuriken Catapults (Underslung)- As above, a little out of place but can help for close range shooting.
Splinter Cannon- Can be taken underslung or in the option turret slot. Like the Splinter Rifles a bit out of place if you are setting the falcon up to be an anti-tank vehicle. When taken with another Splinter Cannon though it can be nasty.
Shuriken Cannon- Again can be taken underslung or in the option Turret slot. The more common choice as it has better synergy with the other weapon options. Can be good for anti-tank or anti-infantry duties.
Pulse Laser- The option that you can't change........and why would you want to?!? Probably one of the most typically Corsair weapons, multiple high strength shots which can make a big mess of almost all targets.
Starcannon- One of my favourite options, good strength and multiple shots with a low AP value, can really make a mess of units like Terminators/Centurions. Has good synergy with the Pulse laser and with the Shuriken Cannon.
Bright Lance- Take this if you are expecting tanks! Good synergy again with the Pulse Laser and able to damage absolutely anything in the game. High strength and with the Lance rule, even Knights and Land Raiders fear this thing.
Dark Lance- As above!
Eldar Missile Launcher- This is the option to take when you really don't know what you want. Expensive in comparison to the others but much more versatile.
Wargear Options:
Void Burners- Deep strike! Very good option for the Falcon as it allows you to start threatening rear armour of vehicles and getting Reavers etc into place to really do some hurt.
Kinetic Shroud- The Corsair version of Holofields really, can be invaluable at times but is a fairly expensive upgrade.
Star Engines- Increases the threat range pretty dramatically. Gets the Falcon into position to really threaten the following turn.
Summary:
The Falcon is a much more expensive option than the Venom and is not an open topped transport but it serves a much different purpose. A tooled up Falcon can really do a lot of damage to armoured targets and teamed up with a unit of Reavers with a Fusion gun and a Haywire Grenade can really strike fear into most Vehicles.
With the exception of the Missile launcher and underslung Shuriken Cannon the weapons upgrades are all pretty cheap and it's definitely worth spending a little on the Void Burners and Kinetic Shroud to get it into position and to keep it alive. Remember that the Kinetic Shroud gets a bonus if you flat out or Deep Strike!