“One name, one password” With Google that is all you need to use all Google Product and Free Services. This is what the new Google webpage is telling you. Using a Google account, you can share photos with Picasa, track your favorite stocks, get more storage for your email with GMail, share your schedule with Google Calendar, create web pages with Blogger and collaborate on documents with Google Documents, make free phone calls and chat face to face, get personalized search results and personalized news, create custom maps and get the same experience on multiple devices. There’s a lot you can do if you have a Google account.
The most important account that you should have is Adsense Account. If you want to make money online, then Adsense is the answer.