For those addicted to (or just with a fondness for) the command line, there is always:
RoboCopy
which is shipped "in the box" with Vista and Windows 7, too:
C:\Users\jeff>robocopy
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ROBOCOPY :: Robust File Copy for Windows
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Started : Mon Aug 01 21:50:48 2011
Simple Usage :: ROBOCOPY source destination /MIR
source :: Source Directory (drive:\path or \\server\share\path).
destination :: Destination Dir (drive:\path or \\server\share\path).
/MIR :: Mirror a complete directory tree.
For more usage information run ROBOCOPY /?
**** /MIR can DELETE files as well as copy them !