Gpanion can be termed as a start page wholly devoted to Google applications. You can access all of the applications and services that Google provides with a mere click.
It tries to make it a bit easier for people to quickly access any of 46 Google apps by laying them all out in a grid. The main page holds 14 Google apps, which one might use on a daily basis, and hitting the folder icon in the lower right will shift to a second grid that holds 32 more.
You can also save your customize your preferences regarding apps that show up in the main grid if you sign into the service with a Google login or OpenID.
It’s a true timesaver by giving people a door to some of the most recurrent services that anybody accesses on a daily basis.