The Bonus Disk
What is on the Bonus Disk? Loads of stuff really...pictures, wallpapers, articles about the making of Uplink, behind the scenes stuff, very early versions of Uplink, music, background info, Book II, a ton of stuff about Uplink:Online (virtually an entire design document), and a few other things. Of course, any Uplink product wouldn't be an Uplink product without a healthy selection of hidden material. The bonus disk will not contain any patches for the game - these will always be publicly available from the website.
Sadly Introversion is no longer selling the bonus disk, however you can download a copy of it here.
Uplink is a trademark of Introversion Software