What was the significance of the Townshend duties?

The taxes that were imposed by the Townshend Acts of 1767
were important because they helped to reignite anger in the colonies against
England.

Just the year before, Parliament had repealed the
Stamp Tax after heated protests from the colonies.  In 1767, however, Charles Townshend
decided to impose new taxes.  These new taxes, which were import duties on things like
glass, paper, and tea, made the colonists angry all over again.  In response, the Sons
of Liberty reorganized, new boycotts were called, and tax collectors were assaulted
again (as they had been over the Stamp Tax).

By imposing
these taxes, Townshend made the eventual revolution more likely besides making the
colonists angry all over again.