I plugged in a freshly formatted external drive, copied a bunch of files to it, and tried to eject it. I couldn’t, because it was in use. Why? Because Spotlight was indexing the contents (specifically, a pair of “gnutar tf” processes were grovelling over the very large archives I’d just copied).
This is now the second major OS release to embed Spotlight into the OS, and there’s still no way to stop it from the GUI. If I didn’t know about “sudo mdutil -i off /Volumes/foo”, it could be hours before I’d be able to eject that external drive. This is really stupid.
Also, a big “WTF?” to the person who replaced the Berkeley “ps” command with a SysV-style version in Leopard. After twenty years of practice, my fingers don’t type in “compatibility mode”.