You can include your own custom HTML links in the top bar of every page in the application (the space where the 'Home' and 'My Workspace' links are).
To add your links, simply add the following to /opt/collabnet/teamforge/sourceforge_home/etc/sourceforge_configuration.properties:
sitelink.link0.text=Your Descriptive Text sitelink.link0.url=http://www.yourcorp.com
Once TeamForge is restarted, your links will become activated. To add more than one (1) link, simply increment the link0, e.g link1, link2.