Phoronix released some benchmarks of the upcoming Ubuntu 9.10, the Karmic Koala. The benchmarks compare it to FreeBSD 8. The Phoronix Testing Suite was used to develop the benchmarks. Although the official release date of Ubuntu 9.10 will not be until October 29th, these benchmarks show that the new version should be speedy and fun to use!
Warning! The Phoronix benchmark article is n i n e p a g e s long, so don't go to it if you aren't in the mood for clicking through ads to get to the article.