Michael's suggestion of using IMAP is a good one. Also note that Google's 
IMAP servers support both 2 and 3 legged OAuth:

http://code.google.com/apis/gmail/oauth/protocol.html

they also support a number of proprietary IMAP commands which make it easier 
to bridge the gap between the standard IMAP protocol and unique Gmail 
features like message labels and Gmail search:

http://code.google.com/apis/gmail/imap/

with those two resources, it should be possible to create a program that can 
connect to any user malbox (as the user or as the admin) and backup all user 
mail. I've actually got an open source program, Got Your Back (GYB) that 
does just that: http://code.google.com/p/got-your-back. Feel free to take a 
look at the source if your looking for examples.

Jay

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