Google just posted a few videos showing all the Google applications loaded on the T-Mobile G1. This includes Seach, Maps, Gmail and Contacts, Calendar, Google Talk and You Tube all enabled with a single sign-on — no further logins are required. The fact that these are fully synchronized to the web negates the need for a desktop application. Nice. Amazon MP3 store, IMing, Street View compass mode and plenty more highlighted in the videos posted links.

From engadget

Video:
T-Mobile G1 Feature walkthrough (Viddler)
Google Mobile Products on Android (YouTube):