Custom tab names for Terminal.app. Just add this to your .bash_profile and restart Terminal.

Terminal Tab Names

# Add to .bash_profile, then restart Terminal (or open a new tab.)
# Usage: tabname "<TAB_NAME>"
#
# Quotes around the new tab name are optional - but make it easier to
#   add tabnames that contain spaces or special characters.
tabname () {
echo -e "\033];$1\007";
}