Hmmmm... I'm a firm believer that bash is the one true shell. However, I usually install tcsh on all the boxes I setup, just for those people who prefer tcsh, and so that any shell scripts written in tcsh still work. As with most things I take the approach of each to his own.

I think it's just plain idiotic to have /bin/sh point to /bin/tcsh (it's probably worse than not having bash installed at all) - it will break scripts bad, real bad!

I have come across some system scripts written in ksh. That was kinda nasty, not exactly a standard shell, I had to install it on 30 odd machines once they had been deployed. Just as well I had written an automatic software distribution system! (Yes, I rewrote the wheel...)