] According to sources, as of 7B44, Apple has also changed
] the default unix shell type from 'tcsh' to 'bash.' While
] no further information was provided on the subject, it's
] assumed the move was made to conform to today's emerging
] linux standards. The bash shell is currently said to be
] the most commonly preferred shell amongst linux users.
] Panther users will still retain the ability to switch to
] other flavors of the unix shell, though one source joked
] that the move gives publishers an excuse to update their
] costly Mac OS X literature.

Nice! I use bash rather then tcsh myself..

AppleInsider: Panther switches to bash as default shell