As with anything on a computer there are several ways to do this - some that are free, some that are not, some that are difficult, and some that are easy.
The first thing you need to note as you try to sync your two computers is their operating systems. Vista is notoriously difficult when it comes to doing things over a network, so you might want to go for an easier, paid solution if your new Tablet or PC has Vista.
Also, the solution will depend on the degree to which you want them synchronized. Here are a few different solutions to the problem of synchronization.