This article is all about benchmarking multiple filesystems commonly used by *NIX (UNIX, Linux, BSD, etc.) users. He tests out EXT2, EXT3, Reiser FS (pronounced ‘raiser’, I think), JFS, and XFS.
I read a good deal of it and was equally surprised with the writer how horribly EXT3 performed on many tests. I’m not quite as surprised as the author that many large distributions use EXT3 by default (SuSE, Red Hat, Fedora (Red Hat or Fedora don’t even have Reiser FS options), Mandrake, College Linux, Debian, etc.), as it is said to be much more stable (and is older) than the other main filesystems.