Berlin Sans is the 752nd most used web font on the web. We know 2 popular websites which used this font. Similar popular professional fonts are Station, Harlow, Theorem, Salt.
You can use the expensive web font Berlin Sans for free, if you are following these steps:
1. Click here to go to the Berlin Sans page on fonts.com
2. Click on Join for Free Web Fonts
3. Enter a email adress and a password and click on Get started free
4. Then click on Create Web Projects and add "Helvetica"
5. Then add the URLs of the domains you want your fonts served to
6. Click on "Publish Options" and insert the shown code into your HTML file
That's all :-)