Lots of lightweight solo tents out there!

I always suggest that folks start their search with www.tarptent.com. I started with their Squall II (34 oz.) model back in late 2005. By now Henry Shires has so many models I can't keep track of them all! He has several solo models, some of them double-wall, all under 2 lbs.

Lightheart, as ETSU says, is another popular brand. So is Six Moon Designs (which has a very similar tent).

For a truly lightweight solo tent, ZPacks still has everyone beat, although since their tents are cuben fiber they cost a lot of $$$.

All these are fully enclosed tents with bathtub floors and bug netting.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey