I came across this shelter from Kelty which I hadn’t see mentioned before:
http://www.kelty.com/p-797-range-tarp.aspx
Min weight: 2lbs 4 oz
Packaged weight: 2lbs 12 oz
Too heavy for me, but it has snow flaps and two doors. Main competitors might be:
GoLite SL2
Black Diamond Beta Light
MSR Twin Sisters
The unique feature of the Kelty Range tarp is that the trekking poles sit on the outside – good for creating more interior space but worse for snow-loading. The mini-vestibules also allow for drip-free entry.

