Just one note when you compile Goblin XNA.
If you're using ALVAR for tracking, and don't need ARTag, then you don't need to download:
1. ARTag distribution
2. Tao framework
When you compile Goblin XNA, make sure to remove the Tao stuff from the references, and remove ARTagTracker from the Device.Vision.Marker directory in the solution explorer of VS 2008.
Then, when you compile the tutorials, you should remove ARTagWrapper.dll from Tutorial 8 and Tutorial 13 as well as the freeglut.dll.
Then in the code, remove the place that has ARTagTracker.
I'll try to make these a little bit easier for the next release.