In Jaguar under tcsh you could set the tab-completion in the terminal to be case insensitive, so, for example, you could type /vol, press tab and have it complete to /Volumes. The old hint doesn't work with Panther and bash, so here's how. As a single command, execute this in Terminal.app:
echo "set completion-ignore-case On" >> ~/.inputrc
Open a new terminal window, and it's working. I don't know of any way to activate it for a single session.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040308230106279