Just like how Microsoft ships IE and other MS products with Windows, Google is shipping a whole bunch of Google Applications with HTC G1, the first Google Android powered mobile phone.
The applications that are built in to HTC G1 by default are: Google Search, Google Talk, Google Maps, GMail, Google Calendar and the contact of mobile are always synchronised with GMail contact.
This official video is hosted on Google Android web site explains how these products work with G1