Cnet's daily download dishes on the multitasker's dream technology. Multiplicity allows its user to transition seamlessly between multiple computers, using only one mouse and one keyboard. One computer acts as the headquarters, with additional ones acting as satellites. You can move the mouse across all screens, and even cut and past from one screen to the next. Installation can be a pain (cnet's Jessica Dolcourt spent two hours on the phone with Norton's tech support before she was up and running), and you can't drag and drop files across screens, but at only $49.99 for the professional version, it might be worth the hassle.