I think we can put to bed the idea that Tarbosaurus and Tyrannosaurus are the same genus of animal. Gregory Paul seems to somewhat disagree with me as he lists it as Tyrannosaurus bataar in his newest book, but I'm convinced they're different enough animals. Another person who obviously disagreed with that idea is Evgeny Maleev, the man who dug the first remains out of the Mongolian desert. Maleev was a Russian scientist. He named other animals as well and cut open his T. bataar to exam its braincase, a topic best left to CT scans today. Maleev's conclusions on Tarbosaurus can be found here. He based his new genus on the skull's anatomy and the associated post-cranial skeleton (i.e. the body). As stated in the article comparing skulls yesterday, the entire animal was noticeably smaller than T. rex. If you didn't read the article yesterday you should!
Also, I'm excited today because my SVP membership has finally been processed!