There is a web board dedicated to Uplink on the Ambrosia Website.
To go to the Ambrosia Web Boards.
and scroll down to the Uplink Web board. You can search through the threads already posted, or post your own question for other Uplink players to answer.
There is also a very comprehensive web board on the Introversion site for game play questions
Remember though, Ambrosia handles any and all technical issues regarding the Mac version of Uplink.
For technical questions, go to the Ambrosia web boards linked above and post your technical question in the Help on the Way forum, or contact Ambrosia Tech Support.