Depends on your definition of light......you can easily build Stan's Alpha 340s into 1,000-1,200 gram wheels. See American Classic Tubeless wheelset, Extralite Hyperclinch or Stan's factory pro build. The best way would be to go Alpha 340, Sapim CX-Ray and Tune or similar light hubset in a 20/24 spoke configuration (if you weigh 150 or less).
well currently i have some custom made velocity aeroheads from a company called oddsandendos (mike garcia) out of florida. but since then he's been gone out of biz.
while these rides nicely.. but i weight it with my cassette and it was 6lbs for both wheels (tires fully pumped included) without skewers.
so, trying to find something lightweight without breaking the bank.