https://chrome.google.com/webstore/detail/gffjhibehnempbkeheiccaincokdjbfe - гугло-почта.
https://chrome.google.com/webstore/detail/kfimchjilnmjmjpdgedcamjninpdkkpk - гугло-ридер.
https://chrome.google.com/webstore/detail/onbgjnpdcjdhjngbnhnhplnamagmiike - СОшечка.
https://chrome.google.com/webstore/detail/ihffmkcfkejomlfnilnmkokcpgclhfeg - погода.
Синхронизация (в т.ч. межбраузерная)
https://chrome.google.com/webstore/detail/ajpgkpeckebdhofmmjfgcjjiiejpodla - букмарки.
https://chrome.google.com/webstore/detail/hdokiejnpimakedhajhdlcegeplioahd - пароли, формы.
Ну и по мелочи
https://chrome.google.com/webstore/detail/cfhdojbkjhnklbpkdaibdccddilifddb - резалка рекламы. А куда без неё?
https://chrome.google.com/webstore/detail/bbncpldmanoknoahidbgmkgobgmhnafh - yes it plays music!
https://chrome.google.com/webstore/detail/ooehfcnceghcfhnilipfdmfoiaahmopc#
А какие установлены у тебя, %username%?