there is zero difference between how to use Seam 1.2, 2.0 or 2.1 with jboss tools so not sure what kinda tutorial you are looking for ? ;)
I've just done a clean install of gaynemede with jboss tool 3 alpha and have run into an issue with creating a seam project.
If I go Preferences -> JBoss Tools -> Web -> Seam then I can create a seam runtime with version 2.0.
However if I then go New -> Seam Web Project -> [Next x3] then the seam runtime dropdown doesn't show the 2.0 seam runtime I created previously. Also when I click the Add.. button it doesnt have the option to create a version 2.0 seam runtime like the dialog does from the Preferences.
If you choose 1.x for the Seam facet version then a Seam 2 runtime won't show up.
Remember to set the facet version to 2 or choose the default configuration with Seam 2, not the Seam 1.