I only found several working docks in my search for a MBA docking station. One of my requirements were a way to hook up two monitors. Unfortunately, none of the available docks had the ability to hook up two monitors without additional hardware. All of them only had 1 displayport or DVI/HDMI connection. I also tried a couple USB 3.0 docking stations at work, Lenovo and Kensington, and I couldn't get the display to work. I'm sure it was driver related but I didn't want to spend too much time trying to figure out the problems. Odd thing was that I had the DisplayLink driver already installed and the USB 3.0 docks were based on the DisplayLink tech. I knew a USB 3.0 dock wouldn't be useful anyways because when you close the lid, the MBA would go to sleep without a third party software, rendering the MBA and dock useless even when connected to power. I may be wrong about this but I believe it will only wake when connected to the display port and connected to power.
So...here are the docks I found that would allow it to wake from sleep
Matrox -
http://www.matrox.com/docking_station/en/ds1/
Belkins -
http://www.belkin.com/us/F4U055-Belkin/p/P-F4U055
Henge Docks -
http://hengedocks.com/order_mba.php
LandingZone -
http://landingzone.net
Matrox...if you read on the Matrox forum, there are driver issues currently. I'm sure it will eventually be sorted but there are problems it right now that haven't been fixed yet. I was ready to purchase this one until I found the Matrox support forum.
Belkins...looks nice and I'm sure it'll be a good product but it hasn't been released yet. I'm assuming they're also experiencing the same driver issues as Matrox since it's based on the same technology.
Henge Dock...haven't been able to find any negative reviews or problems. Only thing is it only offers 1 displayport and only 1 USB port. You still have to manually plug in a power cable and 1 USB wouldn't cut it for my needs. I also needed an ethernet port for my work network.
LandingZone...this is what I ended up purchasing and been using for a couple weeks. When doing my research, I was unable to find any negative reviews. I got the 2.0 Pro model, which offers 4 USB 3.0, ethernet, and displayport. With this dock, I have nothing to plug in when I connect the MBA. When I go to my office, I just plot the MBA on the dock and push the sides in and I'm connected which makes it very convenient for me and well worth the $200 (since my company is paying for it...lol). The other docks, you still need to connect 2 cables, the thunderbolt and power. With this, no cables to mess with
To get the dual monitor setup, I also purchased this USB 3.0 to HDMI/DVI adapter that I have connected to one of the USB 3.0 ports on the LandingZone dock.
http://www.amazon.com/gp/product/B007L6NYAO/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1
DisplayLink updated their drivers a few months ago so anything based on this should work now. It works find for my usage at work. No lag or problems when viewing 1080p videos on both monitors, web browsing, and heavy spreadsheets. It puts a heavier strain on the CPU but it's not anything that I notice in my use.