SharePoint 2007 does not have any forum template or whatever by default.
If you do need something like this, for what I've found so far:
- Use the Discussion Board List ("Área de Debate" in portuguese) under Communications in the "Create" area from View All Site Content.
Note: This list template will NOT be available until you activate the "Team Collaboration Lists" in Site Features.
- Use SPForums from CodePlex
- Whatch out for updates in the Community Kit for SharePoint