SuperSync 4.0 (http://www.supersync.com) has been rebuilt from the ground up to let users sync iTunes libraries across multiple computers and accounts. Now you can access and merge music and video with another SuperSync library, computer, hard drive, network volume, iPhone, iPad, or iPod.
SuperSync eliminates duplication by allowing merging across user accounts and libraries. Users now have an “all access pass” to their iTunes content, says SuperSync President Brad Lowe.
SuperSync 4.0 is available for purchase online for as US$29 for a two-pack, $39 for a five-pack, and $49 for a 10-pack. SuperSync 4.0 is a free upgrade for all current SuperSync owners.