Another option is you plan on accessing your i Tunes library database from multiple computers is to simply put the i Tunes library on the networked hard drive and then point all of your computers to use that database.
Note, however, that you will still need to be very careful about only running one copy of i Tunes at a time as it is not designed to be accessed by multiple computers and data corruption can occur if you try to do this.
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We'll answer several questions here each week, and of course, you can always get help with more immediate concerns from the i Lounge Discussion Forums.
However there are Applescripts that can be used to manually adjust information such play counts and last played dates and it is possible to export your playlists from one library and import them into another.