1. OK so you will want to go to finder and go to what ever your computer username is.
2. Once there go to library then to application support and then click on the folder call tremulous.
3. Open up the tremulous folder and you should see a folder named base.
4. Just copy this folder on to a flash-drive (USB Key).
5. Next Install Tremulous (1.1) on to your new computer.
6. Here is the link for tremulous 1.1
http://www.apple.com/downloads/macosx/games/action_adventure/tremulous.html 7.
*THIS PART IS IMPORTANT* Open up tremulous and join any server.
8. Next close Tremulous and go to the place where tremulous is installed (username/library/Application Support/Tremulous)
9. Once here Insert your USB key (which has your old tremulous base folder) if you haven't already.
10. Delete the base folder that is on your new computer and replace it with your old base folder from your other computer.
11. Close everything and start up tremulous.
Pictures coming soon