SixtyFourSwitcher 1.1が出ていました。Snow Leopardを32/64bitカーネルで起動できるようにするPreference Pane（システム環境設定）です。フリーウェア。

What’s new in version 1.1:

• Fixed a conflict between SixtyFourSwitcher and some other kernel architecture switchers. Since SixtyFourSwitcher works by writing to your Mac’s NVRAM rather than modifying the com.apple.Boot property list file, the settings set by other switchers would always override SixtyFourSwitcher. Now SixtyFourSwitcher will clear the kernel architecture setting out of the property list if it is set.