Maybe resetting your google account on your phone may help - see below for instructions:
Menu>Settings>Applications>Manage Applications>Google Apps> "Clear data">OK
This will delete the Google account details on your mobile.
NB If changing to a new Google Account you may want to transfer contacts/calendar/apps...etc, which were associated with your old Account to your new one?
To enter new details Menu Settings>Data Synchronization>Google and you'll be prompted with the set up dialogue. Enter your new account details.
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Ciao for Now 
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