A lot of those tests are with Anti-Aliasing and Antistropic filtering on, which impacts the 3870's more than it does the 8800 GT's
It's not impossible. It will just depend on circumstances, and won't happen often
Most of them are with Anti-Aliasing and Antistropic filtering on, which impacts the 3870's more than it does the 8800 GT's
without AA, the 3870's will consistently win. With AA, the 8800 GT's should win more often than the 3870's will.
Crossfire will still scale better than SLI, over what a single 3870/8800 GT would get. And I believe the 3870's are cheaper on average, and consume less power.