iGoogle

iGoogle is a great tool to integrate many websites or information. It helps by not having to navigate to the actual website, rather providing a snapshot of the information you need. As it is fully customizable, you can select what you want to see. The interface is extremely well put together, making it simple to change things like your theme, appearance or add gadgets.
There seems to be unlimited gadgets available and it iGoogle even allows you to create your own.
Even Super Mario was available as a gadget, so he lives on my iGoogle page aswell as Google Maps, Facebook and Sudoku!