When you view a Stack Exchange site without being logged in, you see a friendly banner, prompting you to take a tour and understand the features of the site:
This links off to a high quality resource that can help new users understand how the site works. However, the moment a user signs up to the site, this banner disappears from immediate view and hides itself as a link under the help menu.
My proposal is to continue showing this banner until one of the following conditions are met;
- The user gets the "Informed" badge
- The user reaches a set amount of reputation (250 or 500 should be sufficient)
- The user chooses to hide the banner
This should increase the exposure of the tour to new users, who are the people who need the tour, rather than hiding it the moment a user signs up.