Tarps or poncho-tarps are a good option if you are trying to save weight. If I wasn't a hammocker, I might look into something light and extremely easy to set up (minimum of stakes). Pyramids set up with four stakes and some hoop tents only need two (though most use three or four).
Mountain Laurel Designs has a nice two person pyramid which recently appeared on their website, and Integral Designs has a single hoop, two stake shelter for two.
Six Moon design has the Gatewood Cape and a similar shelter with a mesh skirt which I might look at if I were into ground sleeping.