gmail provides POP3, so you can download all your email using a normal email client. they also provide an export contacts to CSV file (comma seperated list). no idea about chat histories. (strangely enough, putting "gmail export" into google turned up the above :))
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Date: Aug. 4th, 2011 10:47 pm (UTC)From:no subject
Date: Aug. 5th, 2011 12:27 am (UTC)From:no subject
Date: Aug. 6th, 2011 01:13 am (UTC)From:they also provide an export contacts to CSV file (comma seperated list). no idea about chat histories. (strangely enough, putting "gmail export" into google turned up the above :))