First Leopard breaks X11 functionality horribly (even as of right now, with the Xquartz 1.2.9a update, X11+ssh tunnelling still occasionally fails on some remote servers) in its transitioning from XFree86 to Xorg. Then the 10.5.1 update of today breaks my Keychain functionality deleted administrator functionality from all my user accounts, forcing me to break out the Leopard install CD to activate the dormant root account on my system to do anything about it. Goddammit Apple.

Thank you, Cupertino, for making me relive my days as a Windows user.