How can I change Terminal.app's default shell to BASH?
For some reason, my friend's Mac (10.6.6) defaults to using TCSH instead of BASH. The obvious remedy is to choose /bin/bash as the command to open shells with (as below), but then it fails to load .bashrc and .bash_profile (even if I give a --source or --rcfile parameter).

How can I switch it to use bash the right way?