In the Backpacker Magazine 2008 Gear Guide is this year’s winner for lightest freestanding tent: the Big Sky International convertible 1-person tent at 1 pound, 12 ounces with tent, outer shell, and carbon fiber poles. Of course, the carbon fiber poles are an extra $100 and you need to add 2.7 ounces for stakes, 3.0 for rainfly and 3.o for ground cloth. That all adds up to 2 pounds, five ounces. Still, it meets my 2-15 rule (if it isn’t 2 pounds, 15 ounces or less it doesn’t qualify as ultralight backpacking equipment). Obviously, that’s arbitrary and some ultra, ultralighters are going to roll their eyes. You can go lower with tarps and bivy sacks, but tarps don’t keep out the bugs and bivvies are coffin-like.
Also worth a look: Big Agnes Seedhouse 1 and the Black Diamond OneShot.
Be light. Be safe. Be one with the pack.