This is a pretty nice add-on despite it not being created by Google. It will add customizable tabs, like the ones pictured above, to your Google Personalized Homepage. You can rename tabs, remove tabs, reorder tabs, create tabs, and move modules between tabs.
All you have to do is add the module to Google: 
If you want to know how to use the tabs then here is the help guide that shows you the various things you can do.
Hopefully Google too ends up implementing this.
I’ve been using Netvibes for quite a while now. Have a good number of tabs all neatly arranged.