Set the Plays ("Play Count" before iTunes v9.2) of the selected tracks to a user-entered number (they will all be set to the same number). If this number is 0 then the Last Played date of each track will be erased. (iTunes has the ability to "Reset Plays" to 0 from a track's contextual menu.)
Also see New Last Played Date and Add or Subtract Play Count.
Batch merge and/or delete playlists
Two scripts copy text from clipboard to current or single selected track's lyrics tag
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Copy number prefix in Song Name of selected tracks to their track number tag
Prefix each selected track's Song Name with the number of its order in the selection.
Rename selected tracks' Song Names with their filenames (minus extension)